| 2019 | 2020 | 2021 | 2022 | 2023 | Change 23/22 | % Change 23/22 | Avg. Gr. (%) | Mean | SD | Min | Max | CV | Share in 2023 (%) | |
| Algeria | 4.50 | 4.50 | 4.50 | 4.50 | 4.50 | 0.00 | 0.00 | 0.00 | 4.50 | 0.00 | 4.50 | 4.50 | 0.00 | 6.00 |
| Congo | 0.28 | 0.28 | 0.28 | 0.28 | 0.28 | 0.00 | 0.00 | -0.05 | 0.28 | 0.00 | 0.28 | 0.28 | 0.00 | 0.38 |
| Equatorial Guinea | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.00 | 0.00 | 0.00 | 0.04 | 0.00 | 0.04 | 0.04 | 0.00 | 0.05 |
| Gabon | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.00 | 0.00 | 0.00 | 0.03 | 0.00 | 0.03 | 0.03 | 0.00 | 0.03 |
| IR Iran | 33.90 | 33.99 | 33.99 | 33.99 | 33.99 | 0.00 | 0.00 | 0.07 | 33.97 | 0.04 | 33.90 | 33.99 | 0.00 | 45.24 |
| Iraq | 3.71 | 3.71 | 3.71 | 3.71 | 3.71 | 0.00 | 0.00 | 0.00 | 3.71 | 0.00 | 3.71 | 3.71 | 0.00 | 4.94 |
| Kuwait | 1.78 | 1.78 | 1.78 | 1.78 | 1.78 | 0.00 | 0.00 | 0.00 | 1.78 | 0.00 | 1.78 | 1.78 | 0.00 | 2.37 |
| Libya | 1.50 | 1.50 | 1.50 | 1.50 | 1.51 | 0.00 | 0.01 | 0.00 | 1.50 | 0.00 | 1.50 | 1.51 | 0.00 | 2.00 |
| Nigeria | 5.76 | 5.75 | 5.85 | 5.91 | 5.94 | 0.03 | 0.50 | 0.78 | 5.84 | 0.09 | 5.75 | 5.94 | 0.01 | 7.91 |
| Saudi Arabia | 8.37 | 8.44 | 8.51 | 9.51 | 9.65 | 0.14 | 1.44 | 3.64 | 8.90 | 0.63 | 8.37 | 9.65 | 0.07 | 12.85 |
| United Arab Emirates | 7.73 | 7.73 | 8.20 | 8.21 | 8.21 | 0.00 | 0.00 | 1.53 | 8.02 | 0.26 | 7.73 | 8.21 | 0.03 | 10.93 |
| Venezuela | 5.67 | 5.59 | 5.54 | 5.51 | 5.48 | -0.04 | -0.64 | -0.88 | 5.56 | 0.08 | 5.48 | 5.67 | 0.01 | 7.29 |
| Total OPEC | 73.28 | 73.35 | 73.94 | 74.99 | 75.12 | 0.13 | 0.18 | 0.62 | 74.14 | 0.88 | 73.28 | 75.12 | 0.01 | 100.00 |