The number of electric and plug-in hybrid cars on the world’s roads exceeded 3 million in 2017, a 54% increase from 2016. China remained the largest electric car market in the world, with 580,000 electric cars sold in 2017, a 72% increase from 2016. The United States had the second-highest, with about 280,000 cars sold in 2017, up from 160,000 in 2016.