Canada is the largest source of U.S. energy imports and the second-largest destination for U.S. energy exports behind only Mexico. Energy is an important component of trade between Canada and the United States. In 2019, based on the latest annual Standard International Trade Classification (SITC) data from the U.S. Census Bureau, energy accounted for US $85 billion, or 27%, of the value of all U.S. imports from Canada. Crude oil and petroleum products accounted for 91% of the value of U.S. energy imports from Canada and 89% of the value of U.S. energy exports to Canada.