https://www.reuters.com/article/us-electricvehicles-iea/number-of-electric-vehicles-on-roads-reaches-three-million-iea-idUSKCN1IV0NE

The number of electric vehicles on roads worldwide rose to a record high of 3.1 million in 2017, but more research, policies and incentives are needed to drive further uptake, the International Energy Agency (IEA) said.