| Joined | Country | % Correct |
|---|---|---|
| 1949 | United Kingdom | 95%
|
| 1949 | United States | 92%
|
| 1949 | France | 90%
|
| 1955 | Germany | 90%
|
| 1949 | Canada | 85%
|
| 1949 | Norway | 85%
|
| 1982 | Spain | 85%
|
| 2024 | Sweden | 85%
|
| 1949 | Portugal | 84%
|
| 2023 | Finland | 82%
|
| 1949 | Italy | 82%
|
| 1949 | Denmark | 80%
|
| 1949 | Belgium | 77%
|
| 1999 | Hungary | 77%
|
| 1999 | Poland | 77%
|
| 2004 | Estonia | 75%
|
| 1949 | Netherlands | 75%
|
| 1952 | Turkey | 75%
|
| 2004 | Latvia | 72%
|
| 2004 | Lithuania | 72%
|
| 1952 | Greece | 70%
|
| 1949 | Iceland | 70%
|
| 1999 | Czech Republic | 69%
|
| 2004 | Bulgaria | 67%
|
| 2009 | Croatia | 67%
|
| 2004 | Slovenia | 67%
|
| 1949 | Luxembourg | 66%
|
| 2004 | Romania | 66%
|
| 2004 | Slovakia | 62%
|
| 2009 | Albania | 61%
|
| 2020 | North Macedonia | 54%
|
| 2017 | Montenegro | 51%
|