| Date | Country | % Correct |
|---|---|---|
| May 16, 1940 | United States | 100%
|
| November 13, 1974 | United Kingdom | 97%
|
| June 3, 1967 | Canada | 96%
|
| June 30, 1972 | France | 93%
|
| November 22, 1971 | Germany | 93%
|
| July 21, 1971 | Japan | 87%
|
| February 13, 1979 | Brazil | 81%
|
| May 30, 1971 | Australia | 80%
|
| May 9, 1977 | Ireland | 77%
|
| August 21, 1971 | Netherlands | 76%
|
| October 27, 1973 | Sweden | 73%
|
| June 7, 1976 | New Zealand | 71%
|
| March 21, 1978 | Belgium | 70%
|
| October 20, 1976 | Switzerland | 67%
|
| July 21, 1977 | Austria | 64%
|
| September 1, 1971 | Panama | 44%
|
| August 4, 1975 | Bahamas | 41%
|
| December 8, 1970 | Costa Rica | 39%
|
| June 6, 1974 | Guatemala | 36%
|
| July 20, 1972 | El Salvador | 27%
|