| Span | Country | % Correct |
|---|---|---|
| 1975-Present | China | 97%
|
| 1922-1991 | Soviet Union | 97%
|
| 1976-Present | Vietnam | 90%
|
| 1976-Present | Cuba | 86%
|
| 1972-Present | North Korea | 86%
|
| 1963-1992 | Yugoslavia | 75%
|
| 1965-1989 | Romania | 68%
|
| 1976-1989 | Poland | 65%
|
| 1971-1991 | Bulgaria | 63%
|
| 1960-1990 | Czechoslovakia | 60%
|
| 1968-1990 | East Germany | 60%
|
| 1976-1991 | Albania | 56%
|
| 1972-1989 | Hungary | 56%
|
| 1960-1990 | Mongolia | 54%
|
| 1969-1991 | Somalia | 25%
|