In 2005, U.S. refineries relied heavily on foreign crude oil, importing a record volume of more than 10.1 million barrels per day (b/d). About 60% of the imported crude oil came from four countries: Canada, Mexico, Saudi Arabia, and Venezuela, and each was responsible for between 12% and 16% of total U.S. crude oil imports that year. By 2019, U.S. crude oil import trading patterns had changed significantly. In total, U.S. crude oil imports have fallen sharply, but imports from Canada have risen steadily to 3.8 million b/d, more than twice the imports from Canada in 2005. U.S. crude oil imports from Canada accounted for 56% of all U.S. crude oil imports in 2019, according to the U.S. Energy Information Administration’s (EIA) Petroleum Supply Monthly.