The plug - in car market penetration reached 2 % in March 2015 , passed 3 % in December 2015 .
The plug - in car market penetration achieved 5 % at the end of 2016 .
The plug - in car market penetration reached 2 % in March 2015 , passed 3 % in December 2015 , and achieved 5 % at the end of 2016 .