Primary School Completion Rate by Country - Adults 25+ Age (2026)

Primary school completion rate measures the percentage of adults aged 25 and older who have successfully completed primary education or achieved higher levels of schooling. This indicator represents a more stringent measure than basic educational exposure, focusing specifically on those who finished their elementary education and received formal certification of primary school graduation.

Understanding Primary School Completion

Primary school completion differs from basic educational attainment by requiring actual graduation from elementary education rather than mere enrollment or partial attendance. This indicator captures adults who successfully finished primary school curricula, typically covering 5-6 years of formal education including literacy, numeracy, basic sciences, and foundational knowledge necessary for secondary education progression. The completion rate reflects both historical educational policies and current demographic composition. Countries with high completion rates demonstrate successful implementation of compulsory education laws, adequate school infrastructure, teacher availability, and economic conditions that enabled families to keep children in school through primary graduation rather than withdrawing them for work or other responsibilities.

Primary School Completion Rate by Country - Adults 25+ Age (2026)

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#	Country	2026 Estimate (%)
1	Australia AU	100%
2	Austria AT	100%
3	Barbados BB	100%
4	Belgium BE	100%
5	Canada CA	100%
6	Denmark DK	100%
7	Finland FI	100%
8	France FR	100%
9	Germany DE	100%
10	Iceland IS	100%
11	Ireland IE	100%
12	Israel IL	100%
13	Italy IT	100%
14	Japan JP	100%
15	Luxembourg LU	100%
16	Malta MT	100%
17	Netherlands NL	100%
18	New Zealand NZ	100%
19	Norway NO	100%
20	Portugal PT	100%
21	Singapore SG	100%
22	Spain ES	100%
23	Sweden SE	100%
24	Switzerland CH	100%
25	United Kingdom GB	100%
26	United States US	100%
27	Azerbaijan AZ	99.9%
28	Belarus BY	99.9%
29	Armenia AM	99.8%
30	Bulgaria BG	99.8%
31	Czech Republic CZ	99.8%
32	Estonia EE	99.8%
33	Greece GR	99.8%
34	Hungary HU	99.8%
35	Kazakhstan KZ	99.8%
36	Latvia LV	99.8%
37	Lithuania LT	99.8%
38	Romania RO	99.8%
39	Russia RU	99.8%
40	San Marino SM	99.8%
41	Slovakia SK	99.8%
42	Slovenia SI	99.8%
43	Ukraine UA	99.8%
44	Antigua and Barbuda AG	99.7%
45	Andorra AD	99.6%
46	Albania AL	99.5%
47	Croatia HR	99.5%
48	Poland PL	99.5%
49	Turkmenistan TM	99.5%
50	Uzbekistan UZ	99.5%
51	Georgia GE	99.2%
52	Kyrgyzstan KG	98.8%
53	Moldova MD	98.8%
54	Curaçao CW	98.5%
55	Kiribati KI	98.5%
56	Qatar QA	98.5%
57	Serbia RS	98.5%
58	Uruguay UY	98.5%
59	Chile CL	97.8%
60	Montenegro ME	97.8%
61	Saint Vincent and the Grenadines VC	97.8%
62	South Korea KR	97.8%
63	Tonga TO	97.8%
64	Namibia NA	97.5%
65	Saint Lucia LC	97.5%
66	Aruba AW	97.2%
67	Jamaica JM	97.2%
68	Trinidad and Tobago TT	97.2%
69	United Arab Emirates AE	97.2%
70	Brunei BN	96.8%
71	Cuba CU	96.8%
72	Indonesia ID	96.8%
73	North Macedonia MK	96.8%
74	Palau PW	96.8%
75	Samoa WS	96.8%
76	Seychelles SC	96.8%
77	Tajikistan TJ	96.8%
78	Philippines PH	96.5%
79	Bosnia and Herzegovina BA	96.2%
80	Cyprus CY	96.2%
81	Fiji FJ	96.2%
82	Grenada GD	96.2%
83	Palestine PS	96.2%
84	Paraguay PY	96.2%
85	Tuvalu TV	96.2%
86	Bahamas BS	95.8%
87	Guyana GY	95.8%
88	Macau MO	95.8%
89	Sri Lanka LK	95.5%
90	Costa Rica CR	95.2%
91	South Africa ZA	95.2%
92	Vietnam VN	95.2%
93	Dominica DM	94.8%
94	Mauritius MU	94.8%
95	Panama PA	94.8%
96	Kuwait KW	94.5%
97	Mongolia MN	94.5%
98	Nauru NR	94.5%
99	Venezuela VE	94.5%
100	China CN	94.2%
101	Thailand TH	94.2%
102	Zimbabwe ZW	93.5%
103	Ecuador EC	93.2%
104	Jordan JO	92.8%
105	Saudi Arabia SA	92.8%
106	Argentina AR	92.5%
107	Bahrain BH	92.5%
108	Colombia CO	92.5%
109	Lebanon LB	92.5%
110	Marshall Islands MH	92.5%
111	Mexico MX	92.5%
112	Peru PE	92.5%
113	Suriname SR	92.5%
114	Bolivia BO	91.8%
115	Dominican Republic DO	91.5%
116	Brazil BR	91.2%
117	Belize BZ	89.5%
118	Zambia ZM	89.5%
119	Eswatini SZ	88.5%
120	Lesotho LS	88.5%
121	Libya LY	88.5%
122	Micronesia FM	88.5%
123	Sao Tome and Principe ST	88.5%
124	Türkiye TR	88.5%
125	Vanuatu VU	88.5%
126	Botswana BW	86.5%
127	Myanmar MM	86.5%
128	Congo CG	85.8%
129	Malaysia MY	85.8%
130	El Salvador SV	85.5%
131	Honduras HN	84.8%
132	Cape Verde CV	84.5%
133	Iran IR	84.5%
134	Uganda UG	84.5%
135	Cambodia KH	82.5%
136	DR Congo CD	82.5%
137	Kenya KE	82.5%
138	Oman OM	82.5%
139	Rwanda RW	81.5%
140	Tunisia TN	79.5%
141	Gabon GA	78.5%
142	Iraq IQ	78.5%
143	Laos LA	78.5%
144	Malawi MW	78.5%
145	Nicaragua NI	78.5%
146	Maldives MV	76.5%
147	Syria SY	76.5%
148	Madagascar MG	75.5%
149	Tanzania TZ	75.5%
150	Cameroon CM	72.8%
151	Egypt EG	72.8%
152	Guatemala GT	72.5%
153	Nigeria NG	72.5%
154	Ghana GH	71.8%
155	India IN	71.5%
156	Bangladesh BD	68.5%
157	Equatorial Guinea GQ	68.5%
158	Papua New Guinea PG	68.5%
159	Algeria DZ	68.2%
160	Haiti HT	65.5%
161	Mozambique MZ	65.5%
162	Central African Republic CF	62.8%
163	Comoros KM	58.5%
164	Liberia LR	58.5%
165	Nepal NP	58.5%
166	Togo TG	58.5%
167	Morocco MA	56.5%
168	Timor-Leste TL	56.5%
169	Mauritania MR	52.5%
170	Pakistan PK	52.5%
171	Yemen YE	52.5%
172	Angola AO	48.5%
173	Gambia GM	48.5%
174	Ivory Coast CI	48.5%
175	Burundi BI	48.2%
176	Sudan SD	46.5%
177	Ethiopia ET	45.8%
178	Guinea-Bissau GW	45.8%
179	Bhutan BT	42.5%
180	Djibouti DJ	42.5%
181	Sierra Leone SL	38.5%
182	Senegal SN	35.5%
183	Benin BJ	32.8%
184	Eritrea ER	32.5%
185	Guinea GN	32.5%
186	Chad TD	28.5%
187	Mali ML	28.5%
188	Afghanistan AF	23.5%
189	Burkina Faso BF	18.5%
190	Niger NE	18.5%
191	Somalia SO	18.5%

Global Leaders in Primary Completion

Developed nations achieve near-universal primary completion, with 52 countries projected to reach or maintain 100% rates by 2026. These include Australia, Canada, most European Union members, and several Nordic countries that established comprehensive primary education systems generations ago. Countries like Austria, Belgium, Denmark, and Finland represent the gold standard of universal primary completion. Post-Soviet countries maintain exceptionally high completion rates (95-100%) due to the emphasis on universal education during the Soviet era. The Baltic states, Eastern European EU members, and Central Asian republics demonstrate the lasting impact of systematic educational investment, with countries like Estonia, Lithuania, and Kazakhstan achieving near-perfect completion rates.

Regional Completion Patterns

Sub-Saharan Africa shows the greatest challenges in primary completion, with countries like Niger (18.5%), Somalia (18.5%), and Burkina Faso (18.5%) projected for 2026. These low rates reflect multiple barriers including poverty preventing school completion, inadequate school infrastructure, teacher shortages, child labor demands, and security challenges disrupting education systems. Latin American countries generally achieve strong completion rates (85-95%), with most successfully implementing universal primary education policies. Countries like Chile (97.8%), Uruguay (98.5%), and Argentina (92.5%) demonstrate the region's commitment to educational access, though rural and indigenous populations often face persistent completion gaps. Asian countries show dramatic variation, from near-universal completion in East Asia to significant challenges in South Asia and conflict-affected regions. While countries like Japan (100%), South Korea (97.8%), and Singapore (100%) achieve excellence, nations like Afghanistan (23.5%), Pakistan (52.5%), and Nepal (58.5%) struggle with completion due to poverty, gender barriers, and geographic challenges.

Factors Affecting Completion Rates

Economic development strongly influences primary completion, as wealthier countries can invest in school infrastructure, teacher training, nutrition programs, and social safety nets that support completion. However, the relationship is complex—some middle-income countries achieve high completion through prioritizing education spending and implementing effective policies targeting completion barriers. Gender equality significantly impacts completion rates. Countries with strong traditions of educating both boys and girls achieve higher overall completion, while those with gender disparities in educational access show lower rates. Cultural attitudes toward education, particularly for girls, create substantial completion gaps in some regions. Geographic and infrastructure factors create completion challenges. Rural populations often lack nearby schools, requiring long commutes or boarding arrangements that many families cannot afford. Countries with difficult terrain, scattered populations, or inadequate transportation infrastructure face particular challenges in ensuring children can complete primary education.

Economic and Social Impact

Primary school completion creates foundation for economic development and social progress. Adults with completed primary education demonstrate higher literacy rates, better health outcomes, increased civic participation, and greater economic productivity. Countries with high completion rates typically show stronger democratic institutions, lower poverty rates, and more equitable development patterns. The completion rate serves as a predictor of future educational achievement. Countries with high primary completion typically achieve better secondary and tertiary education outcomes, creating positive cycles of human capital development. Conversely, low primary completion rates constrain economic growth and social development for generations.

2026 Projections and Demographic Trends

The projections reflect gradual improvement in most regions, with global average completion rates expected to increase modestly. The largest projected gains occur in Sub-Saharan Africa, where education expansion programs of the past two decades are beginning to show impact as educated cohorts enter the adult population. Countries with the most significant projected improvements include Chad (+3.3 points), Guinea (+3.3 points), and several other African nations where primary education access has expanded substantially. However, even with these improvements, substantial completion gaps persist, requiring sustained investment and policy focus. Conflict-affected countries show minimal projected improvement due to ongoing educational system disruption. Afghanistan, Syria, and Somalia face particular challenges in rebuilding educational infrastructure and addressing the completion gaps created by years of conflict and instability.

Primary School Completion Rate by Country - Adults 25+ Age (2026)

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#	Country	2019 (%)	2020 (%)	2021 (%)	2022 (%)	2023 (%)	2024 (%)	2026 Estimate (%)
1	Australia	-	-	-	-	99.5%	99.5%	100%
2	Austria	-	-	-	-	100%	-	100%
3	Barbados	-	-	-	-	-	-	100%
4	Belgium	-	-	-	-	100%	-	100%
5	Canada	-	-	-	-	100%	100%	100%
6	Denmark	-	-	-	-	100%	-	100%
7	Finland	-	-	-	-	100%	-	100%
8	France	-	-	-	-	100%	-	100%
9	Germany	-	-	-	-	100%	-	100%
10	Iceland	-	-	-	-	100%	-	100%
11	Ireland	-	-	-	-	100%	-	100%
12	Israel	-	-	-	-	100%	-	100%
13	Italy	-	-	-	-	100%	-	100%
14	Japan	-	100%	-	-	-	-	100%
15	Luxembourg	-	-	-	-	100%	-	100%
16	Malta	-	-	-	-	100%	-	100%
17	Netherlands	-	-	-	-	100%	-	100%
18	New Zealand	-	-	-	-	-	-	100%
19	Norway	-	-	-	-	100%	-	100%
20	Portugal	-	-	-	-	100%	100%	100%
21	Singapore	-	100%	-	-	-	-	100%
22	Spain	-	-	-	-	100%	-	100%
23	Sweden	-	-	-	-	-	-	100%
24	Switzerland	-	-	-	-	100%	100%	100%
25	United Kingdom	-	-	100%	-	-	100%	100%
26	United States	-	-	-	-	100%	100%	100%
27	Azerbaijan	-	-	-	-	99.84%	-	99.9%
28	Belarus	99.79%	-	-	-	-	-	99.9%
29	Armenia	-	-	-	-	99.65%	-	99.8%
30	Bulgaria	-	-	-	-	99.65%	-	99.8%
31	Czech Republic	-	-	-	-	99.65%	-	99.8%
32	Estonia	-	-	-	-	99.65%	-	99.8%
33	Greece	-	-	-	-	99.65%	99.65%	99.8%
34	Hungary	-	-	-	-	99.65%	-	99.8%
35	Kazakhstan	99.65%	-	-	-	-	-	99.8%
36	Latvia	-	-	-	-	99.65%	-	99.8%
37	Lithuania	-	-	-	-	99.65%	-	99.8%
38	Romania	-	-	-	-	99.65%	-	99.8%
39	Russia	-	-	-	-	-	-	99.8%
40	San Marino	-	-	99.65%	-	-	99.65%	99.8%
41	Slovakia	-	-	-	-	99.65%	-	99.8%
42	Slovenia	-	-	-	-	99.65%	-	99.8%
43	Ukraine	99.65%	-	-	-	-	-	99.8%
44	Antigua and Barbuda	-	-	-	-	99.42%	-	99.7%
45	Andorra	-	-	-	99.15%	-	-	99.6%
46	Albania	97.44%	97.91%	97.83%	97.85%	99.28%	-	99.5%
47	Croatia	-	-	-	-	99.17%	-	99.5%
48	Poland	-	99.17%	-	-	-	-	99.5%
49	Turkmenistan	-	-	99.17%	-	-	99.17%	99.5%
50	Uzbekistan	-	-	99.17%	-	-	99.17%	99.5%
51	Georgia	-	-	-	-	98.84%	-	99.2%
52	Kyrgyzstan	-	-	-	-	98.54%	-	98.8%
53	Moldova	-	-	-	-	98.54%	98.54%	98.8%
54	Curaçao	-	98.17%	-	-	-	-	98.5%
55	Kiribati	-	-	-	-	98.17%	-	98.5%
56	Qatar	-	-	98.17%	-	-	98.17%	98.5%
57	Serbia	-	-	-	-	98.17%	98.17%	98.5%
58	Uruguay	-	-	-	-	98.17%	98.17%	98.5%
59	Chile	-	-	-	-	97.54%	97.54%	97.8%
60	Montenegro	-	97.17%	-	-	-	-	97.8%
61	Saint Vincent and the Grenadines	-	-	-	-	-	-	97.8%
62	South Korea	-	-	-	-	97.54%	97.54%	97.8%
63	Tonga	-	-	-	-	97.54%	-	97.8%
64	Namibia	-	-	-	-	97.17%	-	97.5%
65	Saint Lucia	-	97.17%	-	-	-	-	97.5%
66	Aruba	-	-	-	-	96.48%	-	97.2%
67	Jamaica	-	-	96.84%	-	-	96.84%	97.2%
68	Trinidad and Tobago	-	-	96.84%	-	-	96.84%	97.2%
69	United Arab Emirates	-	-	-	-	96.84%	96.84%	97.2%
70	Brunei	-	-	-	-	96.17%	-	96.8%
71	Cuba	96.54%	-	-	-	-	-	96.8%
72	Indonesia	-	-	-	-	96.54%	-	96.8%
73	North Macedonia	-	-	-	-	96.54%	96.54%	96.8%
74	Palau	-	96.54%	-	-	-	-	96.8%
75	Samoa	-	-	96.54%	-	-	96.54%	96.8%
76	Seychelles	-	-	-	-	96.54%	-	96.8%
77	Tajikistan	-	-	-	-	-	-	96.8%
78	Philippines	-	-	96.17%	-	-	96.17%	96.5%
79	Bosnia and Herzegovina	-	-	-	-	95.54%	-	96.2%
80	Cyprus	-	-	-	-	95.54%	-	96.2%
81	Fiji	-	-	95.54%	-	-	95.54%	96.2%
82	Grenada	-	-	-	-	95.54%	-	96.2%
83	Palestine	-	-	-	-	95.84%	95.84%	96.2%
84	Paraguay	-	-	-	-	95.84%	95.84%	96.2%
85	Tuvalu	95.84%	-	-	-	-	-	96.2%
86	Bahamas	95.15%	-	-	-	-	-	95.8%
87	Guyana	95.17%	-	-	-	-	-	95.8%
88	Macau	-	-	-	-	-	-	95.8%
89	Sri Lanka	-	-	95.17%	-	-	95.17%	95.5%
90	Costa Rica	-	94.54%	-	-	-	-	95.2%
91	South Africa	-	-	-	-	94.84%	94.84%	95.2%
92	Vietnam	-	-	-	-	94.84%	-	95.2%
93	Dominica	-	-	94.17%	-	-	94.17%	94.8%
94	Mauritius	-	-	-	-	94.17%	-	94.8%
95	Panama	-	-	-	-	94.54%	94.54%	94.8%
96	Kuwait	-	-	-	-	-	-	94.5%
97	Mongolia	-	-	-	-	93.17%	-	94.5%
98	Nauru	-	-	-	-	93.17%	-	94.5%
99	Venezuela	93.17%	-	-	-	-	-	94.5%
100	China	-	93.84%	-	-	-	-	94.2%
101	Thailand	-	-	93.84%	-	-	93.84%	94.2%
102	Zimbabwe	-	-	-	-	92.17%	-	93.5%
103	Ecuador	-	-	92.54%	-	-	92.54%	93.2%
104	Jordan	-	-	-	-	92.17%	-	92.8%
105	Saudi Arabia	-	-	-	-	92.17%	92.17%	92.8%
106	Argentina	-	-	-	-	-	-	92.5%
107	Bahrain	-	-	91.84%	-	-	91.84%	92.5%
108	Colombia	-	-	91.84%	-	-	91.84%	92.5%
109	Lebanon	-	-	-	-	-	-	92.5%
110	Marshall Islands	-	-	91.17%	-	-	91.17%	92.5%
111	Mexico	-	91.17%	-	-	-	-	92.5%
112	Peru	-	-	-	-	91.17%	91.17%	92.5%
113	Suriname	-	-	91.17%	-	-	91.17%	92.5%
114	Bolivia	-	-	-	-	90.54%	-	91.8%
115	Dominican Republic	90.17%	-	-	-	-	-	91.5%
116	Brazil	-	-	-	-	-	-	91.2%
117	Belize	-	-	87.84%	-	-	87.84%	89.5%
118	Zambia	-	-	-	-	88.17%	-	89.5%
119	Eswatini	-	-	-	-	87.17%	-	88.5%
120	Lesotho	-	-	-	-	87.17%	87.17%	88.5%
121	Libya	-	-	-	-	-	-	88.5%
122	Micronesia	-	-	-	-	-	-	88.5%
123	Sao Tome and Principe	87.17%	-	-	-	-	-	88.5%
124	Türkiye	-	-	-	-	87.17%	-	88.5%
125	Vanuatu	-	-	-	-	87.17%	-	88.5%
126	Botswana	-	-	-	-	84.84%	-	86.5%
127	Myanmar	85.17%	-	-	-	-	-	86.5%
128	Congo	-	-	-	-	-	-	85.8%
129	Malaysia	-	-	-	-	-	-	85.8%
130	El Salvador	-	-	-	-	84.17%	-	85.5%
131	Honduras	-	-	83.54%	-	-	83.54%	84.8%
132	Cape Verde	-	-	-	-	-	-	84.5%
133	Iran	-	-	-	-	83.17%	-	84.5%
134	Uganda	-	-	83.17%	-	-	83.17%	84.5%
135	Cambodia	-	-	-	-	80.17%	-	82.5%
136	DR Congo	-	-	-	-	-	-	82.5%
137	Kenya	-	-	81.17%	-	-	81.17%	82.5%
138	Oman	-	-	-	-	-	-	82.5%
139	Rwanda	-	-	-	-	80.17%	80.17%	81.5%
140	Tunisia	-	-	-	-	78.17%	-	79.5%
141	Gabon	-	-	-	-	-	-	78.5%
142	Iraq	-	-	76.17%	-	-	76.17%	78.5%
143	Laos	-	-	-	-	76.17%	-	78.5%
144	Malawi	-	76.17%	-	-	-	-	78.5%
145	Nicaragua	-	-	-	-	-	-	78.5%
146	Maldives	-	-	-	-	-	-	76.5%
147	Syria	-	-	-	-	-	-	76.5%
148	Madagascar	-	-	73.17%	-	-	73.17%	75.5%
149	Tanzania	-	-	72.17%	-	-	72.17%	75.5%
150	Cameroon	-	-	-	-	-	-	72.8%
151	Egypt	-	-	-	-	70.54%	-	72.8%
152	Guatemala	-	-	70.17%	-	-	70.17%	72.5%
153	Nigeria	-	-	70.17%	-	-	70.17%	72.5%
154	Ghana	-	-	69.54%	-	-	69.54%	71.8%
155	India	-	-	-	-	69.17%	-	71.5%
156	Bangladesh	-	-	54.73%	-	-	54.73%	68.5%
157	Equatorial Guinea	-	-	-	-	-	-	68.5%
158	Papua New Guinea	-	-	66.17%	-	-	66.17%	68.5%
159	Algeria	64.01%	-	-	-	-	-	68.2%
160	Haiti	-	-	-	-	-	-	65.5%
161	Mozambique	-	-	62.17%	-	-	62.17%	65.5%
162	Central African Republic	60.54%	-	-	-	-	-	62.8%
163	Comoros	-	-	56.17%	-	-	56.17%	58.5%
164	Liberia	56.17%	-	-	-	-	-	58.5%
165	Nepal	-	-	55.17%	-	-	55.17%	58.5%
166	Togo	-	-	55.17%	-	-	55.17%	58.5%
167	Morocco	-	-	-	-	-	-	56.5%
168	Timor-Leste	-	-	53.17%	-	-	53.17%	56.5%
169	Mauritania	-	-	-	-	-	-	52.5%
170	Pakistan	-	-	49.17%	-	-	49.17%	52.5%
171	Yemen	-	-	-	-	49.17%	-	52.5%
172	Angola	-	-	-	-	-	-	48.5%
173	Gambia	-	-	-	-	46.17%	-	48.5%
174	Ivory Coast	-	-	-	-	-	-	48.5%
175	Burundi	-	-	-	-	-	-	48.2%
176	Sudan	-	-	43.17%	-	-	43.17%	46.5%
177	Ethiopia	-	-	43.54%	-	-	43.54%	45.8%
178	Guinea-Bissau	-	-	-	-	-	-	45.8%
179	Bhutan	-	-	39.17%	-	-	39.17%	42.5%
180	Djibouti	-	-	-	-	-	-	42.5%
181	Sierra Leone	35.17%	-	-	-	-	-	38.5%
182	Senegal	-	-	-	-	32.17%	-	35.5%
183	Benin	-	-	29.54%	-	-	29.54%	32.8%
184	Eritrea	-	-	-	-	-	-	32.5%
185	Guinea	-	-	-	-	-	-	32.5%
186	Chad	25.17%	-	-	-	-	-	28.5%
187	Mali	-	-	25.17%	-	-	25.17%	28.5%
188	Afghanistan	-	19.04%	15.25%	21.03%	-	-	23.5%
189	Burkina Faso	-	-	15.17%	-	-	15.17%	18.5%
190	Niger	-	-	15.17%	-	-	15.17%	18.5%
191	Somalia	-	-	15.17%	-	-	15.17%	18.5%

Methodology

This analysis utilizes UNESCO Institute for Statistics (UIS) data from household surveys and censuses across 186 countries (2000-2025). The indicator measures the percentage of adults aged 25 and older who have completed primary education or achieved higher educational levels, based on self-reported educational attainment in nationally representative surveys.

The 2026 estimates represent scenario-informed projections, not authoritative predictions or exact forecasts. They indicate likely direction and relative magnitude based on country-specific evaluation incorporating demographic factors. For each nation, we conducted individual assessment examining historical completion trends (calculating annual change rates where multiple data points exist), demographic transition patterns, educational system development, economic development trajectory, and data reliability considerations. Countries with clear trends and recent data use observed patterns as foundation, while those with limited or older data are assessed using regional benchmarks and comparable country analysis. All projections account for the gradual nature of adult educational attainment change (realistic annual change 0.3-1.0 percentage points) and demographic constraints based on population age structure. Values are rounded to reflect inherent uncertainty in forward-looking estimates.

Rather than applying uniform formulas, each country receives individual contextual assessment. Our analytical process: (1) Examine historical completion trends from available data points (e.g., if 2015: 70% and 2023: 75%, annual rate = +0.6%/year), (2) Evaluate sustainability given demographic structure and educational system capacity, (3) Analyze education-specific developments relevant to primary completion (school infrastructure expansion, teacher training programs, compulsory education law implementation, poverty reduction programs enabling completion, nutrition and health programs supporting attendance, gender equality initiatives, economic development reducing child labor, demographic changes as younger educated cohorts age into 25+ group), (4) Compare with regional context and comparable countries to validate reasonableness, (5) Adjust for baseline value and demographic constraints (higher baselines = slower change due to ceiling effects), (6) Consider data recency and educational developments during data gaps. Countries showing unusual jumps are analyzed for survey methodology changes. For countries with older data, we assess educational system trajectory and demographic change rather than assuming stagnation.

Most countries have recent data (2019+), representing current completion levels with 162 countries having data from the last 7 years. For countries with older data, we assessed education-specific developments during the data gap: primary school construction and infrastructure expansion, teacher recruitment and training programs, compulsory education law enforcement and monitoring, economic development reducing child labor and enabling completion, nutrition and health programs supporting school attendance, gender equality initiatives increasing girls' completion, adult literacy and second-chance education programs, and demographic transition as educated youth cohorts mature into the 25+ population. These contextual factors are used qualitatively to inform direction and magnitude, not as precise quantitative inputs. Sub-Saharan African countries show larger projected increases reflecting education expansion programs beginning to impact adult population composition. Post-Soviet countries maintain very high rates with minimal change due to already achieving near-universal primary completion. High-income countries approach ceiling effects with rates above 95%, showing minimal projected change as demographic replacement occurs gradually.