| Year Joined | Country | % Correct |
|---|---|---|
| 2004 | Canada | 98%
|
| 1989 | United Kingdom | 98%
|
| 2006 | Brazil | 97%
|
| 1987 | Germany | 97%
|
| 1969 | United States | 97%
|
| 1988 | France | 96%
|
| 1979 | Japan | 96%
|
| 1998 | China | 95%
|
| 1990 | Italy | 95%
|
| 2007 | Mexico | 95%
|
| 2007 | Russia | 95%
|
| 2007 | India | 92%
|
| 2004 | Spain | 92%
|
| 2008 | Australia | 90%
|
| 2006 | South Korea | 90%
|
| 2017 | Indonesia | 88%
|
| 2022 | Saudi Arabia | 86%
|
| 2025 | Poland | 83%
|
| 2023 | Turkey | 78%
|
| 2021 | Netherlands | 75%
|
| 2025 | Switzerland | 66%
|