| Decades | Country | % Correct |
|---|---|---|
| 1820, 1920– | Mexico | 99%
|
| 2000– | China | 97%
|
| 1820–1880, 1900–1960 | United Kingdom | 97%
|
| 1820–1890, 1920–1960 | Germany | 94%
|
| 1820–1850 | France | 93%
|
| 1980– | India | 93%
|
| 1890–1910, 1990 | Russia | 93%
|
| 1890–1950 | Italy | 91%
|
| 1830–1880, 1910–1970 | Canada | 89%
|
| 1820–1890 | Ireland | 88%
|
| 1960–1970 | Cuba | 78%
|
| 1970–1980 | South Korea | 74%
|
| 1970– | Philippines | 68%
|
| 1860–1880, 1900 | Sweden / Norway | 68%
|
| 1890–2010 | Austria-Hungary | 52%
|
| 1980– | Dominican Republic | 51%
|