According to the latest statistics released by the World Bank in 2025, among the OPEC countries in 1962, Venezuela ranked first in terms of gross domestic product(GDP), with a total economic volume of $8.95 billion; Nigeria ranked second in terms of GDP, with a total economic volume of $4.91 billion; Iran ranked third in terms of GDP, with a total economic volume of $4.69 billion; Algeria ranked fourth in terms of GDP, with a total economy of $2 billion; and Iraq, with a total economy of $1.96 billion, ranked fifth in GDP.
| Rank | Country | GDP |
|---|---|---|
| 1 | Venezuela | $8.95 billion |
| 2 | Nigeria | $4.91 billion |
| 3 | Iran | $4.69 billion |
| 4 | Algeria | $2 billion |
| 5 | Iraq | $1.96 billion |
| 6 | Gabon | $0.18 billion |
| 7 | Republic of Congo | $0.17 billion |
| 8 | Equatorial Guinea | $0.01 billion |