| Since | Country | % Correct |
|---|---|---|
| 1987 | Canada | 100%
|
| 1991 | Denmark | 100%
|
| 1994 | Finland | 100%
|
| 1987 | Germany | 100%
|
| 1987 | Norway | 100%
|
| 2005 | Portugal | 100%
|
| 1995 | Spain | 100%
|
| 1987 | Sweden | 100%
|
| 1987 | United States | 100%
|
| 1987 | Belgium | 93%
|
| 2023 | Croatia | 93%
|
| 1993 | France | 93%
|
| 1987 | Iceland | 93%
|
| 1987 | Japan | 93%
|
| 1987 | Netherlands | 93%
|
| 2001 | South Korea | 93%
|
| 1992 | United Kingdom | 93%
|
| 2020 | Andorra | 87%
|
| 1987 | Australia | 87%
|
| 1992 | Austria | 87%
|
| 2001 | Cyprus | 87%
|
| 1996 | Ireland | 87%
|
| 1997 | Israel | 87%
|
| 1995 | Italy | 87%
|
| 2025 | Liechtenstein | 87%
|
| 1992 | Luxembourg | 87%
|
| 1987 | New Zealand | 87%
|
| 1999 | Singapore | 87%
|
| 2009 | Slovakia | 87%
|
| 2007 | Slovenia | 87%
|
| 2009 | Czech Republic | 80%
|
| 2011 | Estonia | 80%
|
| 2001 | Greece | 80%
|
| 2014 | Latvia | 80%
|
| 2015 | Lithuania | 80%
|
| 2008 | Malta | 80%
|
| 2021 | San Marino | 80%
|
| 1987 | Switzerland | 80%
|
| 1997 | Taiwan | 73%
|
| 2026 | Bulgaria | 60%
|