| Since | Answer | % Correct |
|---|---|---|
| 1987 | Australia | 100%
|
| 1987 | Belgium | 100%
|
| 1987 | Canada | 100%
|
| 1987 | Finland | 100%
|
| 1987 | France | 100%
|
| 1987 | Germany | 100%
|
| 1987 | Iceland | 100%
|
| 1987 | Ireland | 100%
|
| 1987 | Italy | 100%
|
| 1987 | Japan | 100%
|
| 1987 | Norway | 100%
|
| 1994 | Portugal | 100%
|
| 1987 | Spain | 100%
|
| 1987 | Sweden | 100%
|
| 1987 | U.K. | 100%
|
| 1987 | U.S.A. | 100%
|
| 1987 | Austria | 98%
|
| 1987 | Denmark | 98%
|
| 1987 | Netherlands | 98%
|
| 1987 | New Zealand | 98%
|
| 2009 | Poland | 98%
|
| 2001 | South Korea | 98%
|
| 1987 | Switzerland | 98%
|
| 2006 | Czech Republic | 96%
|
| 1996 | Greece | 96%
|
| 1987 | Israel | 96%
|
| 2007 | Slovakia | 96%
|
| 2006 | Estonia | 94%
|
| 1997 | Slovenia | 94%
|
| 2017 | Croatia | 92%
|
| 2014 | Hungary | 92%
|
| 2012 | Latvia | 92%
|
| 2012 | Lithuania | 92%
|
| 2002 | Malta | 92%
|
| 1987 | Luxembourg | 90%
|
| 2004 | Saudi Arabia | 90%
|
| 1987 | Singapore | 90%
|
| 1994 | Monaco | 88%
|
| 1987 | U.A.E. | 88%
|
| 1990 | Andorra | 86%
|
| 1994 | Liechtenstein | 86%
|
| 2000 | San Marino | 86%
|
| 2007 | Oman | 84%
|
| 1987 | Qatar | 84%
|
| 1987 | Taiwan | 84%
|
| 1987 | Bahamas | 80%
|
| 2001 | Bahrain | 78%
|
| 2012 | Chile | 78%
|
| 1987 | Kuwait | 76%
|
| 1988 | Cyprus | 73%
|
| 1990 | Brunei | 67%
|
| 2012 | Uruguay | 63%
|
| 2006 | Trinidad and Tobago | 59%
|
| 2006 | Barbados | 57%
|
| 2012 | St. Kitts and Nevis | 55%
|
| 2014 | Seychelles | 53%
|
| 2012 | Antigua and Barbuda | 51%
|
| 2020 | Palau | 31%
|
| 2019 | Nauru | 27%
|