As of the launch of this question, the members of OPEC were Algeria, the Republic of the Congo, Equatorial Guinea, Gabon, Iran, Iraq, Kuwait, Libya, Nigeria, Saudi Arabia, the UAE, and Venezuela (OPEC - September 2024 Monthly Oil Market Report, see Table 5-7 on page 60 of the file). A change in status publicly announced by a member of the Declaration of Cooperation (aka OPEC+) will not count, but ceasing to be a member state and joining OPEC+ will count (OPEC - Declaration of Cooperation). The last OPEC member state to leave the organization was Angola, which announced its decision in late December 2023 (Al Jazeera). The date the member state leaves is immaterial so long as a specific date that the departure is to take effect is within a year and a day of the announcement.

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