| 2000 | 2012 | |
|---|---|---|
| Gabon | 8.0 | 9.0 |
| Congo | 8.0 | 9.0 |
| Saudi Arabia | 16.0 | 16.0 |
| Equatorial Guinea | 8.0 | 11.0 |
| Qatar | 26.0 | 29.0 |
| Nigeria | 7.0 | 10.0 |
| United Arab Emirates | 23.0 | 28.0 |
| Algeria | 16.0 | 12.0 |
| Libya | 16.0 | 19.0 |
| Angola | 7.0 | 10.0 |
| Ecuador | 19.0 | 23.0 |
| Iraq | 15.0 | 24.0 |
| Iran | 23.0 | 22.0 |
| Venezuela (Bolivarian Republic of) | 27.0 | 34.0 |
| Kuwait | 19.0 | 17.0 |