| Year | Country | % Correct |
|---|---|---|
| 1973 | United States | 88%
|
| 1974 | Sweden | 78%
|
| 1975 | France | 73%
|
| 1973 | Denmark | 71%
|
| 1975 | Austria | 43%
|
| 1955 | Soviet Union | 41%
|
| 1965 | Cuba | 23%
|
| 1950 | North Korea | 15%
|
| 1974 | Singapore | 14%
|
| 1973 | Tunisia | 4%
|