| Year Joined | Country | % Correct |
|---|---|---|
| 2023 | Finland | 99%
|
| 1982 | Spain | 99%
|
| 1949 | United States | 98%
|
| 1949 | Canada | 96%
|
| 1952 | Greece | 96%
|
| 1949 | Italy | 96%
|
| 1949 | United Kingdom | 96%
|
| 1955 | West Germany | 96%
|
| 1949 and 2009 | France | 95%
|
| 1999 | Poland | 94%
|
| 1949 | Portugal | 94%
|
| 1949 | Norway | 93%
|
| 2024 | Sweden | 92%
|
| 1999 | Czechia | 90%
|
| 1949 | Denmark | 90%
|
| 2004 | Romania | 90%
|
| 1949 | Belgium | 89%
|
| 2004 | Estonia | 89%
|
| 2004 | Latvia | 89%
|
| 1949 | Netherlands | 89%
|
| 2004 | Slovakia | 89%
|
| 2004 | Slovenia | 88%
|
| 2009 | Croatia | 87%
|
| 1999 | Hungary | 86%
|
| 2004 | Lithuania | 86%
|
| 1952 | Turkey | 86%
|
| 2004 | Bulgaria | 85%
|
| 1949 | Luxembourg | 85%
|
| 2009 | Albania | 81%
|
| 1949 | Iceland | 80%
|
| 2017 | Montenegro | 79%
|
| 2021 | Northern Macedonia | 75%
|