| Date | Current population | Country | % Correct |
|---|---|---|---|
| 1420 | 1,426 mil | China | 100%
|
| 1450 | 1,361 mil | India | 99%
|
| 1915 | 328 mil | United States | 96%
|
| 1930 | 144 mil | Russia | 87%
|
| 1965 | 268 mil | Indonesia | 85%
|
| 1972 | 212 mil | Brazil | 79%
|
| 1988 | 203 mil | Pakistan | 77%
|
| 1967 | 127 mil | Japan | 74%
|
| 1988 | 167 mil | Bangladesh | 70%
|
| 1992 | 199 mil | Nigeria | 63%
|
| 1999 | 132 mil | Mexico | 61%
|
| 2014 | 107 mil | Philippines | 61%
|
| 2016 | 109 mil | Ethiopia | 53%
|
| 2019 | 100 mil | Egypt | 52%
|