California increased the number of zero-emission vehicles in the state by 1300 percent in six years—growing from 25,000 in 2012 to more than 350,000 today—and zero-emission vehicles now account for approximately 5 percent of all new car sales in California - https://www.gov.ca.gov/2018/01/26/governor-brown-takes-action-to-increase-zero-emission-vehicles-fund-new-climate-investments/