| Years | Country | % Correct |
|---|---|---|
| 1968- | Eswatini | 97%
|
| 1966- | Lesotho | 97%
|
| 1990- | Namibia | 97%
|
| 1966- | Botswana | 96%
|
| 1975- | Mozambique | 93%
|
| 1910-19681979-1980 | United Kingdom | 93%
|
| 1980- | Zimbabwe | 92%
|
| 1910-1915 | Germany | 75%
|
| 1964-1990 | Zambia | 75%
|
| 1975-1990 | Angola | 74%
|
| 1910-1975 | Portugal | 70%
|
| 1965-1979 | Rhodesia | 65%
|