| Last year of recognition | Country | % Correct |
|---|---|---|
| 1991 | USSR | 97%
|
| 1992 | Yugoslavia | 91%
|
| 1992 | Czechoslovakia | 79%
|
| 1971 | Republic of China | 79%
|
| 1990 | GDR | 74%
|
| 1990 | North Yemen | 50%
|
| 1990 | South Yemen | 50%
|
| 1964 | Tanganyika | 21%
|
| 1964 | Zanzibar | 18%
|