| Year | Host Country | % Correct |
|---|---|---|
| 1981 | United States | 100%
|
| 2001 | United States | 100%
|
| 1979 | United Kingdom | 98%
|
| 2002 | United Kingdom | 98%
|
| 1990 | China | 97%
|
| 1994 | Hong Kong | 97%
|
| 2016 | Hong Kong | 97%
|
| 1964 | Soviet Union | 97%
|
| 1968 | Soviet Union | 97%
|
| 1973 | Soviet Union | 97%
|
| 2003 | Japan | 96%
|
| 1995 | Canada | 95%
|
| 1965 | East Germany | 95%
|
| 1974 | East Germany | 95%
|
| 1983 | France | 95%
|
| 1989 | Germany | 94%
|
| 2009 | Germany | 94%
|
| 1992 | Russia | 94%
|
| 2017 | Brazil | 92%
|
| 2005 | Mexico | 92%
|
| 1988 | Australia | 91%
|
| 2008 | Spain | 91%
|
| 1996 | India | 90%
|
| 1997 | Argentina | 89%
|
| 2012 | Argentina | 89%
|
| 2000 | South Korea | 89%
|
| 1991 | Sweden | 88%
|
| 2004 | Greece | 87%
|
| 1963 | Poland | 87%
|
| 1972 | Poland | 87%
|
| 1986 | Poland | 87%
|
| 2014 | South Africa | 84%
|
| 1985 | Finland | 83%
|
| 1977 | Yugoslavia | 83%
|
| 1976 | Austria | 82%
|
| 2011 | Netherlands | 82%
|
| 1961 | Hungary | 81%
|
| 1970 | Hungary | 81%
|
| 1982 | Hungary | 81%
|
| 1959 | Romania | 81%
|
| 1960 | Romania | 81%
|
| 1969 | Romania | 81%
|
| 1978 | Romania | 81%
|
| 1999 | Romania | 81%
|
| 1993 | Turkey | 81%
|
| 1966 | Bulgaria | 78%
|
| 1975 | Bulgaria | 78%
|
| 1971 | Czechoslovakia | 77%
|
| 2015 | Thailand | 76%
|
| 2007 | Vietnam | 73%
|
| 2013 | Colombia | 70%
|
| 1998 | Taiwan | 65%
|
| 1967 | Yugoslavia | 65%
|
| 1962 | Czechoslovakia | 64%
|
| 1984 | Czechoslovakia | 64%
|
| 1987 | Cuba | 60%
|
| 2006 | Slovenia | 58%
|
| 2010 | Kazakhstan | 39%
|