| 2019 | 2020 | 2021 | 2022 | 2023 | Change 23/22 | % Change 23/22 | Avg. Gr. (%) | Mean | SD | Min | Max | CV | Share in 2023 (%) | |
| Algeria | 0.66 | 0.61 | 0.62 | 0.64 | 0.66 | 0.01 | 2.03 | -0.10 | 0.64 | 0.02 | 0.61 | 0.66 | 0.03 | 7.68 |
| Congo | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.00 | 6.30 | 2.95 | 0.02 | 0.00 | 0.02 | 0.02 | 0.06 | 0.21 |
| 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 | 0.02 | 0.02 | 0.02 | 0.02 | 0.00 | 3.77 | 15.74 | 0.02 | 0.00 | 0.01 | 0.02 | 0.22 | 0.24 |
| IR Iran | 1.71 | 1.58 | 1.67 | 1.74 | 1.77 | 0.04 | 2.17 | 1.00 | 1.69 | 0.08 | 1.58 | 1.77 | 0.04 | 20.76 |
| Iraq | 0.75 | 0.59 | 0.74 | 0.83 | 0.93 | 0.09 | 11.32 | 5.58 | 0.77 | 0.13 | 0.59 | 0.93 | 0.16 | 10.85 |
| Kuwait | 0.89 | 0.78 | 0.85 | 0.98 | 1.24 | 0.26 | 26.50 | 8.85 | 0.95 | 0.18 | 0.78 | 1.24 | 0.19 | 14.55 |
| Libya | 0.08 | 0.08 | 0.13 | 0.15 | 0.11 | -0.04 | -24.24 | 10.09 | 0.11 | 0.03 | 0.08 | 0.15 | 0.28 | 1.31 |
| Nigeria | 0.01 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 184.50 | 19.50 | 0.01 | 0.01 | 0.00 | 0.02 | 0.81 | 0.19 |
| Saudi Arabia | 2.59 | 2.18 | 2.55 | 2.77 | 2.53 | -0.24 | -8.62 | -0.55 | 2.52 | 0.21 | 2.18 | 2.77 | 0.09 | 29.58 |
| United Arab Emirates | 1.01 | 0.93 | 1.04 | 0.95 | 0.97 | 0.02 | 2.21 | -0.79 | 0.98 | 0.05 | 0.93 | 1.04 | 0.05 | 11.39 |
| Venezuela | 0.74 | 0.34 | 0.27 | 0.27 | 0.28 | 0.01 | 3.53 | -21.99 | 0.38 | 0.21 | 0.27 | 0.74 | 0.54 | 3.22 |
| Total OPEC | 8.44 | 7.11 | 7.90 | 8.38 | 8.55 | 0.17 | 2.08 | 0.31 | 8.08 | 0.59 | 7.11 | 8.55 | 0.07 | 100.00 |