The numbers above (thanks to this blog) show the cumulative sales of battery (full) electric vehicles (BEV of FEV) and Plug-in (PHEV) en with range extender (EREV) for the USA, up to march 2013. Impressive numbers in a difficult market. It is too early to see if this is exponential growth, or if it will become linear. Same discussion as in the Netherlands, see here for the most recent numbers.
Steinbuch 