| 2019 | 2020 | 2021 | 2022 | 2023 | Change 23/22 | % Change 23/22 | Avg. Gr. (%) | Mean | SD | Min | Max | CV | Share in 2023 (%) | |
| Algeria | 0.58 | 0.44 | 0.45 | 0.48 | 0.48 | 0.01 | 1.22 | -4.66 | 0.49 | 0.06 | 0.44 | 0.58 | 0.12 | 2.45 |
| Congo | 0.31 | 0.28 | 0.25 | 0.24 | 0.25 | 0.01 | 2.58 | -5.27 | 0.27 | 0.03 | 0.24 | 0.31 | 0.11 | 1.26 |
| Equatorial Guinea | 0.11 | 0.11 | 0.09 | 0.08 | 0.05 | -0.03 | -33.00 | -16.30 | 0.09 | 0.02 | 0.05 | 0.11 | 0.27 | 0.27 |
| Gabon | 0.21 | 0.20 | 0.18 | 0.18 | 0.20 | 0.02 | 10.36 | -0.34 | 0.19 | 0.01 | 0.18 | 0.21 | 0.06 | 1.04 |
| IR Iran | 0.65 | 0.40 | 0.76 | 0.90 | 1.32 | 0.42 | 46.86 | 19.38 | 0.81 | 0.34 | 0.40 | 1.32 | 0.42 | 6.71 |
| Iraq | 3.97 | 3.43 | 3.44 | 3.71 | 3.47 | -0.25 | -6.62 | -3.32 | 3.60 | 0.24 | 3.43 | 3.97 | 0.07 | 17.59 |
| Kuwait | 1.99 | 1.83 | 1.74 | 1.88 | 1.57 | -0.31 | -16.57 | -5.75 | 1.80 | 0.16 | 1.57 | 1.99 | 0.09 | 7.95 |
| Libya | 1.04 | 0.35 | 1.09 | 0.92 | 1.02 | 0.10 | 11.29 | -0.29 | 0.88 | 0.31 | 0.35 | 1.09 | 0.35 | 5.19 |
| Nigeria | 2.01 | 1.88 | 1.59 | 1.39 | 1.48 | 0.09 | 6.33 | -7.41 | 1.67 | 0.27 | 1.39 | 2.01 | 0.16 | 7.49 |
| Saudi Arabia | 7.04 | 6.66 | 6.23 | 7.36 | 6.66 | -0.70 | -9.56 | -1.37 | 6.79 | 0.43 | 6.23 | 7.36 | 0.06 | 33.79 |
| United Arab Emirates | 2.41 | 2.42 | 2.30 | 2.72 | 2.65 | -0.07 | -2.43 | 2.37 | 2.50 | 0.17 | 2.30 | 2.72 | 0.07 | 13.45 |
| Venezuela | 0.85 | 0.49 | 0.45 | 0.44 | 0.55 | 0.11 | 25.56 | -10.21 | 0.55 | 0.17 | 0.44 | 0.85 | 0.31 | 2.79 |
| Total OPEC | 21.16 | 18.48 | 18.58 | 20.30 | 19.71 | -0.60 | -2.94 | -1.76 | 19.65 | 1.14 | 18.48 | 21.16 | 0.06 | 100.00 |