| Year | Country | % Correct |
|---|---|---|
| 1955 | United States | 100%
|
| 1967 | Canada | 96%
|
| 1972 | France | 92%
|
| 1971 | Germany | 85%
|
| 1971 | Japan | 81%
|
| 1971 | Netherlands | 81%
|
| 1971 | Australia | 69%
|
| 1971 | Panama | 35%
|
| 1970 | Costa Rica | 23%
|
| 1972 | El Salvador | 15%
|