| 2019 | 2020 | 2021 | 2022 | 2023 | Change 23/22 | % Change 23/22 | Avg. Gr. (%) | Mean | SD | Min | Max | CV | Share in 2023 (%) | |
| Algeria | 0.43 | 0.38 | 0.42 | 0.43 | 0.47 | 0.04 | 9.48 | 2.33 | 0.43 | 0.03 | 0.38 | 0.47 | 0.07 | 5.20 |
| Congo | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 3.23 | -1.90 | 0.01 | 0.00 | 0.01 | 0.01 | 0.08 | 0.09 |
| Equatorial Guinea | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 13.00 | 1.95 | 0.00 | 0.00 | 0.00 | 0.01 | 0.06 | 0.06 |
| Gabon | 0.05 | 0.04 | 0.04 | 0.05 | 0.05 | 0.00 | 1.38 | -0.85 | 0.05 | 0.00 | 0.04 | 0.05 | 0.05 | 0.51 |
| IR Iran | 1.84 | 1.69 | 1.78 | 1.79 | 1.84 | 0.05 | 2.61 | 0.03 | 1.79 | 0.06 | 1.69 | 1.84 | 0.03 | 20.26 |
| Iraq | 0.72 | 0.55 | 0.62 | 0.83 | 0.93 | 0.11 | 12.85 | 6.86 | 0.73 | 0.15 | 0.55 | 0.93 | 0.21 | 10.29 |
| Kuwait | 0.46 | 0.46 | 0.46 | 0.47 | 0.46 | -0.01 | -2.50 | -0.19 | 0.46 | 0.00 | 0.46 | 0.47 | 0.01 | 5.03 |
| Libya | 0.21 | 0.18 | 0.19 | 0.19 | 0.20 | 0.01 | 4.11 | -1.63 | 0.20 | 0.01 | 0.18 | 0.21 | 0.06 | 2.21 |
| Nigeria | 0.47 | 0.47 | 0.49 | 0.52 | 0.48 | -0.03 | -6.45 | 0.77 | 0.49 | 0.02 | 0.47 | 0.52 | 0.04 | 5.33 |
| Saudi Arabia | 3.14 | 2.93 | 2.97 | 3.17 | 3.28 | 0.10 | 3.25 | 1.07 | 3.10 | 0.15 | 2.93 | 3.28 | 0.05 | 36.07 |
| UAE | 0.90 | 0.83 | 0.92 | 0.96 | 1.02 | 0.06 | 6.70 | 3.24 | 0.92 | 0.07 | 0.83 | 1.02 | 0.08 | 11.25 |
| Venezuela | 0.37 | 0.19 | 0.23 | 0.27 | 0.34 | 0.06 | 23.47 | -2.16 | 0.28 | 0.07 | 0.19 | 0.37 | 0.26 | 3.70 |
| Total OPEC | 8.59 | 7.73 | 8.13 | 8.69 | 9.08 | 0.39 | 4.48 | 1.38 | 8.45 | 0.52 | 7.73 | 9.08 | 0.06 | 100.00 |