| Date | Current population | Country | % Correct |
|---|---|---|---|
| 100 B.C. | 1,397 m | China | 100%
|
| 500 | 1,348 m | India | 100%
|
| 1880 | 329 m | United States | 95%
|
| 1825 | 147 m | Russia | 94%
|
| 1893 | 83 m | Germany | 91%
|
| 1911 | 126 m | Japan | 87%
|
| 1916 | 268 m | Indonesia | 85%
|
| 1948 | 66 m | United Kingdom | 84%
|
| 1949 | 210 m | Brazil | 82%
|
| 1960 | 60 m | Italy | 81%
|
| 1964 | 204 m | Pakistan | 77%
|
| 1966 | 67 m | France | 75%
|
| 1960 | 166 m | Bangladesh | 74%
|
| 1965 | 200 m | Nigeria | 72%
|
| 1969 | 125 m | Mexico | 70%
|
| 1985 | 99 m | Egypt | 61%
|
| 1977 | 95 m | Vietnam | 61%
|
| 1982 | 108 m | Philippines | 60%
|
| 1985 | 82 m | Turkey | 60%
|
| 1987 | 83 m | Iran | 58%
|
| 1992 | 108 m | Ethiopia | 57%
|
| 1984 | 69 m | Thailand | 56%
|
| 2003 | 84 m | D.R. Congo | 51%
|
| 2008 | 58 m | South Africa | 49%
|
| 2014 | 56 m | Tanzania | 49%
|
| 2017 | 53 m | Kenya | 46%
|
| 2012 | 52 m | South Korea | 46%
|
| 2005 | 54 m | Myanmar | 42%
|