| Time | Country | % Correct |
|---|---|---|
| 1949 - Present | China | 93%
|
| 1922 - 1991 | Soviet Union | 93%
|
| 1948 - 1992 | North Korea | 71%
|
| 1943 - 1992 | Yugoslavia | 71%
|
| 1946 - 1990 | Bulgaria | 68%
|
| 1949 - 1990 | East Germany | 68%
|
| 1949 - 1989 | Hungary | 68%
|
| 1947 -1989 | Romania | 68%
|
| 1924 - 1992 | Mongolia | 54%
|
| 1919 - 1991 | Ukraine | 50%
|
| 1975 - 1992 | Angola | 43%
|
| 1975 - 1990 | Mozambique | 32%
|
| 1969 - 1991 | Somalia | 29%
|
| 1975 - 1990 | Benin | 18%
|
| 1978 - 1987 | Afganistan | 11%
|