US EV sales in 2015 were 116,000.
That's 0.66% of total unit auto sales.
EV sales compares with 122,000 units in 2014, or negative growth in 2015 by 6,000 units, or about 5%.
http://www.autonews.com/article/20160105/RETAIL01/160109995/...
http://insideevs.com/monthly-plug-in-sales-scorecard/
(I'd happened to have looked this up a day or so back in another discussion.)