| 2019 | 2020 | 2021 | 2022 | 2023 | Change 23/22 | % Change 23/22 | Avg. Gr. (%) | Mean | SD | Min | Max | CV | Share in 2023 (%) | |
| Algeria | 0.51 | 0.50 | 0.49 | 0.51 | 0.52 | 0.01 | 1.29 | 0.46 | 0.51 | 0.01 | 0.49 | 0.52 | 0.02 | 10.71 |
| Congo | 0.01 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 8.50 | -4.02 | 0.00 | 0.00 | 0.00 | 0.01 | 0.14 | 0.10 |
| Equatorial Guinea | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | na | na | 0.00 | 0.00 | 0.00 | 0.00 | na | 0.00 |
| Gabon | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 3.64 | 8.62 | 0.01 | 0.00 | 0.01 | 0.01 | 0.13 | 0.22 |
| IR Iran | 0.28 | 0.28 | 0.33 | 0.38 | 0.41 | 0.03 | 6.54 | 9.45 | 0.34 | 0.06 | 0.28 | 0.41 | 0.17 | 8.49 |
| Iraq | 0.11 | 0.15 | 0.16 | 0.17 | 0.20 | 0.03 | 14.86 | 16.69 | 0.16 | 0.03 | 0.11 | 0.20 | 0.21 | 4.11 |
| Kuwait | 0.64 | 0.53 | 0.60 | 0.71 | 0.96 | 0.25 | 35.66 | 10.92 | 0.69 | 0.17 | 0.53 | 0.96 | 0.24 | 20.05 |
| Libya | 0.02 | 0.07 | 0.09 | 0.10 | 0.09 | -0.01 | -8.64 | 44.20 | 0.07 | 0.03 | 0.02 | 0.10 | 0.43 | 1.89 |
| Nigeria | 0.02 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | na | -39.16 | 0.01 | 0.01 | 0.00 | 0.02 | 1.29 | 0.06 |
| Saudi Arabia | 1.30 | 1.02 | 1.34 | 1.47 | 1.27 | -0.20 | -13.34 | -0.54 | 1.28 | 0.17 | 1.02 | 1.47 | 0.13 | 26.45 |
| United Arab Emirates | 0.88 | 0.84 | 0.89 | 0.90 | 1.14 | 0.24 | 26.56 | 6.69 | 0.93 | 0.12 | 0.84 | 1.14 | 0.13 | 23.75 |
| Venezuela | 0.10 | 0.07 | 0.07 | 0.18 | 0.20 | 0.02 | 14.08 | 19.84 | 0.12 | 0.06 | 0.07 | 0.20 | 0.51 | 4.18 |
| Total OPEC | 3.87 | 3.47 | 4.00 | 4.44 | 4.81 | 0.37 | 8.44 | 5.60 | 4.12 | 0.52 | 3.47 | 4.81 | 0.13 | 100.00 |