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According to the latest statistics released by the World Bank in 2024, among the OPEC countries in 1975, Iran ranked first in terms of gross domestic product(GDP), with a total economic volume of $51.78 billion; Saudi Arabia ranked second in terms of GDP, with a total economic volume of $46.77 billion; Nigeria ranked third in terms of GDP, with a total economic volume of $27.78 billion; Venezuela ranked fourth in terms of GDP, with a total economy of $27.47 billion; and Algeria, with a total economy of $15.56 billion, ranked fifth in GDP.