| Joined | Country | % Correct |
|---|---|---|
| 1949 | United States | 93%
|
| 1949 | Canada | 86%
|
| 1955 | Germany | 79%
|
| 1949 | United Kingdom | 79%
|
| 1949 | France | 64%
|
| 2024 | Sweden | 50%
|
| 1949 | Belgium | 43%
|
| 1949 | Norway | 43%
|
| 1949 | Italy | 36%
|
| 1949 | Netherlands | 36%
|
| 1999 | Poland | 36%
|
| 1982 | Spain | 36%
|
| 1949 | Denmark | 29%
|
| 1949 | Portugal | 29%
|
| 2004 | Estonia | 21%
|
| 2023 | Finland | 21%
|
| 1949 | Iceland | 21%
|
| 1949 | Luxembourg | 21%
|
| 2004 | Latvia | 14%
|
| 2004 | Lithuania | 14%
|
| 1999 | Czech Republic | 7%
|
| 1999 | Hungary | 7%
|
| 2004 | Romania | 7%
|
| 2004 | Slovakia | 7%
|
| 1952 | Turkey | 7%
|
| 2009 | Albania | 0%
|
| 2004 | Bulgaria | 0%
|
| 2009 | Croatia | 0%
|
| 1952 | Greece | 0%
|
| 2017 | Montenegro | 0%
|
| 2020 | North Macedonia | 0%
|
| 2004 | Slovenia | 0%
|