The U.S. economy burned through an average of 20.46 million barrels of crude oil and related liquids each day last year, according to BP‘s latest annual Statistical Review of World Energy. That was about 500,000 barrels per day (BPD), or 2.5%, more than 2017’s total, and the largest demand increase in more than a decade. Overall, America accounted for 20.5% of the world’s oil and related liquid consumption last year. (That includes liquid derivatives of coal and natural gas, as well as biodiesel and biogasoline products such as ethanol.) What was interesting, though, is that the amount of oil the U.S. used to make fuels like gasoline fell last year. Here’s a look at what actually drove demand growth.