| Date | Population | Country | % Correct |
|---|---|---|---|
| 1961 | 215 m | Brazil | 100%
|
| 500 | 1,434 m | China | 100%
|
| 1900 | 342 m | United States | 100%
|
| 600 | 1,420 m | India | 97%
|
| 1953 | 276 m | Indonesia | 94%
|
| 1941 | 123 m | Japan | 94%
|
| 1900 | 144 m | Russia | 94%
|
| 1981 | 220 m | Nigeria | 91%
|
| 1998 | 116 m | Philippines | 91%
|
| 1978 | 237 m | Pakistan | 89%
|
| 1963 | 83 m | Germany | 86%
|
| 2004 | 124 m | Ethiopia | 83%
|
| 1985 | 128 m | Mexico | 83%
|
| 1975 | 171 m | Bangladesh | 80%
|
| 2003 | 111 m | Egypt | 80%
|
| 1997 | 98 m | Vietnam | 71%
|
| 2010 | 88 m | Iran | 69%
|
| 2013 | 100 m | D.R.Congo | 63%
|
| 2012 | 85 m | Turkey | 60%
|