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According to the latest statistics released by the World Bank in 2025, among the OPEC countries in 1976, Iran ranked first in terms of gross domestic product(GDP), with a total economic volume of $68.06 billion; Saudi Arabia ranked second in terms of GDP, with a total economic volume of $64.01 billion; Nigeria ranked third in terms of GDP, with a total economic volume of $36.31 billion; Venezuela ranked fourth in terms of GDP, with a total economy of $31.42 billion; and United Arab Emirates, with a total economy of $19.21 billion, ranked fifth in GDP.