| Year joined | Country | % Correct |
|---|---|---|
| 1960 | Iran | 100%
|
| 1960 | Kuwait | 100%
|
| 1962 | Libya | 100%
|
| 1960 | Saudi Arabia | 100%
|
| 1969 | Algeria | 88%
|
| 1960 | Iraq | 88%
|
| 1971 | Nigeria | 75%
|
| 1960 | Venezuela | 75%
|
| 2017 | Equatorial Guinea | 50%
|
| 2016 | Gabon | 50%
|
| 2018 | Republic of the Congo | 38%
|