| Year | Rank | Country | % Correct |
|---|---|---|---|
| 2010, 2016 | 10, 3 | United States | 96%
|
| 2017 | 1 | Canada | 91%
|
| 2018 | 9 | China | 91%
|
| 2011, 2016 | 9, 2 | Japan | 91%
|
| 2016 | 6 | Australia | 90%
|
| 2011, 2014 | 2, 1 | Brazil | 90%
|
| 2010, 2018 | 7, 5 | New Zealand | 89%
|
| 2014 | 4 | Sweden | 88%
|
| 2014 | 6 | Mexico | 87%
|
| 2011 | 7 | Italy | 86%
|
| 2010 | 3 | Greece | 84%
|
| 2019 | 7 | Indonesia | 84%
|
| 2018 | 10 | South Africa | 84%
|
| 2013, 2018 | 3, 2 | South Korea | 84%
|
| 2017 | 3 | Finland | 83%
|
| 2018 | 1 | Chile | 82%
|
| 2010, 2018 | 8, 3 | Portugal | 82%
|
| 2012 | 5 | Denmark | 81%
|
| 2013 | 7 | Iceland | 81%
|
| 2013 | 8 | Turkey | 81%
|
| 2010, 2015 | 5, 10 | Morocco | 80%
|
| 2017 | 2 | Colombia | 79%
|
| 2010, 2019 | 2, 2 | Germany | 79%
|
| 2015 | 5 | Ireland | 79%
|
| 2012 | 7 | Cuba | 77%
|
| 2016 | 7 | Poland | 77%
|
| 2012 | 10 | Switzerland | 77%
|
| 2016 | 10 | Fiji | 74%
|
| 2010, 2014 | 4, 10 | Malaysia | 74%
|
| 2015 | 1 | Singapore | 73%
|
| 2010, 2017 | 6, 5 | Nepal | 72%
|
| 2014 | 8 | Belgium | 71%
|
| 2011, 2019 | 4, 4 | Panama | 71%
|
| 2015 | 8 | Philippines | 71%
|
| 2012 | 9 | Taiwan | 70%
|
| 2012 | 3 | Ukraine | 70%
|
| 2013 | 4 | Ecuador | 69%
|
| 2011 | 8 | Tanzania | 69%
|
| 2013 | 10 | Madagascar | 67%
|
| 2018 | 6 | Malta | 67%
|
| 2013, 2019 | 1, 1 | Sri Lanka | 67%
|
| 2017 | 7 | Mongolia | 66%
|
| 2013 | 5 | Slovakia | 66%
|
| 2016 | 5 | Latvia | 65%
|
| 2016 | 8 | Uruguay | 65%
|
| 2011 | 5 | Bulgaria | 64%
|
| 2015 | 3 | Lithuania | 64%
|
| 2014 | 7 | Seychelles | 64%
|
| 2012 | 6 | Bhutan | 63%
|
| 2015 | 7 | Serbia | 63%
|
| 2017 | 8 | Oman | 61%
|
| 2017 | 4 | Dominica | 60%
|
| 2012, 2019 | 4, 6 | Jordan | 60%
|
| 2011 | 1 | Albania | 59%
|
| 2017 | 10 | Ethiopia | 59%
|
| 2018 | 7 | Georgia | 59%
|
| 2018 | 8 | Mauritius | 59%
|
| 2015 | 2 | Namibia | 59%
|
| 2019 | 10 | Belize | 58%
|
| 2012, 2017 | 2, 9 | Myanmar | 57%
|
| 2016 | 1 | Botswana | 56%
|
| 2013 | 2 | Montenegro | 55%
|
| 2015 | 4 | Nicaragua | 54%
|
| 2015 | 9 | St. Lucia | 53%
|
| 2019 | 8 | Belarus | 52%
|
| 2011 | 3 | Cape Verde | 52%
|
| 2010 | 1 | El Salvador | 52%
|
| 2012 | 1 | Uganda | 51%
|
| 2016 | 4 | Palau | 50%
|
| 2015 | 6 | R. Congo | 50%
|
| 2010 | 9 | Suriname | 50%
|
| 2011 | 6 | Vanuatu | 49%
|
| 2019 | 3 | Zimbabwe | 48%
|
| 2013 | 6 | Solomon Islands | 47%
|
| 2014 | 9 | Macedonia | 44%
|
| 2019 | 9 | São Tomé | 44%
|
| 2013 | 9 | Dominican Rep. | 43%
|
| 2019 | 5 | Kyrgyzstan | 39%
|
| 2014 | 5 | Malawi | 37%
|
| 2018 | 4 | Djibouti | 28%
|