For May, an estimated 16,568 plug-ins were sold, a gain of...

For May, an estimated 16,568 plug-ins were sold, a gain of 44.5%.

Looking at the full year after 5 months, ~71,758 electric vehicles have been sold, a gain of 44% over the ~49,839 sold though May of 2016.

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http://insideevs.com/may-2017-plug-electric-vehicle-sales-report-card/