The U.S. imported 4.6 million barrels of oil per day from Canada, Mexico and Saudi Arabia in 2013, according to the Energy Information Administration. The figure, which is 61% of the country's total imports, was the highest since 1973. "These countries generally produce medium to heavy, sour crude oil that is desirable to U.S. refineries, while increasing U.S. crude oil production from tight oil formations is typically of the light sweet quality," the agency said.

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