| Year | Country | % Correct |
|---|---|---|
| 1955 | United States | 100%
|
| 1967 | Canada | 96%
|
| 1972 | France | 92%
|
| 1971 | Germany | 84%
|
| 1971 | Japan | 80%
|
| 1971 | Netherlands | 80%
|
| 1971 | Australia | 68%
|
| 1971 | Panama | 32%
|
| 1970 | Costa Rica | 20%
|
| 1972 | El Salvador | 16%
|