2011 Nissan LEAFs. Nissan LEAF accounts for more than 300,000 or 10% of all plug-in cars.
Through the end of November 2017, we are certain that the world's fleet of plug-in electric vehicles have exceeded a level of 3 million.
This year;s plug-in sales alone already exceed one million, which means that with expected sales of well over 1.7-2.0 million in 2018, we should top ~5 million by the end of 2018.
Currently, EV Sales Blog tally mentions 3.3 million through the end of November.
Many new, better models are coming to the market - while incentives keep gaining strength; this is why we shouldn't expect anything other than rapid growth ... on average of 50-100% annually for quite some time.
With around 80 million cars sold every year worldwide, plug-ins are becoming more and more important.
Here is how The Guardian visualises growth of sales driven mainly by China:
Plug-in car sales (source: The Guardian)