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According to the latest statistics released by the World Bank in 2025, among the OPEC countries in 2000, Saudi Arabia ranked first in terms of gross domestic product(GDP), with a total economic volume of $189.52 billion; Venezuela ranked second in terms of GDP, with a total economic volume of $117.14 billion; Iran ranked third in terms of GDP, with a total economic volume of $109.59 billion; United Arab Emirates ranked fourth in terms of GDP, with a total economy of $104.34 billion; and Nigeria, with a total economy of $69.45 billion, ranked fifth in GDP.