| Years | Country | % Correct |
|---|---|---|
| 1949– | China | 94%
|
| 1922–1991 | Soviet Union | 93%
|
| 1948–2009 | North Korea | 83%
|
| 1959– | Cuba | 82%
|
| 1945–1976 | North Vietnam | 81%
|
| 1976– | Vietnam | 81%
|
| 1944–1989 | Poland | 73%
|
| 1945–1991 | Yugoslavia | 69%
|
| 1947–1989 | Romania | 64%
|
| 1949–1989 | Hungary | 60%
|
| 1975– | Laos | 60%
|
| 1946–1990 | Bulgaria | 58%
|
| 1979–1989 | Cambodia | 58%
|
| 1949–1990 | East Germany | 57%
|
| 1948–1990 | Czechoslovakia | 53%
|
| 1924–1990 | Mongolia | 50%
|
| 1946–1992 | Albania | 47%
|
| 1978–1992 | Afghanistan | 39%
|
| 1975–1992 | Angola | 32%
|
| 1970–1991 | Rep. of the Congo | 25%
|
| 1987–1991 | Ethiopia | 24%
|
| 1975–1990 | Mozambique | 21%
|
| 1969–1991 | Somalia | 21%
|
| 1967–1990 | South Yemen | 16%
|
| 1979–1983 | Grenada | 12%
|
| 1975–1990 | Benin | 10%
|