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1950s 15% 1960s 20% 1970s 36% 1980s 42% 1990s 50% 2000s ?. United States Petroleum Imports. American Petroleum Institute, 1999.
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1950s 15% 1960s 20% 1970s 36% 1980s 42% 1990s 50% 2000s ? United States Petroleum Imports American Petroleum Institute, 1999