740, 000 sold over what period?  Since EV's tried to move into mainstream?  Actually the total number for global EV car sales in 2015 was 540,000.  (http://www.ev-volumes.com/news/global-plug-in-vehicle-sales/).  Of course for 2015 the global car sales were 88,700,000 which means that your EV car sales for that year represented 0.6% of the total.  Given all the fuss over EV's I would have expected a bigger impact.  However I note that the Nissan Leaf, the most popular EV in Canada at #66 in sales ranking (http://www.goodcarbadcar.net/2017/03/canada-february-2017-ytd-car-sales-by-model.html) has managed only 178 deliveries (Jan-Feb 2017) which is a big increase over last years 123 for the same time frame.  The 2017 Honda Civic, by way of comparison, had deliveries in the first two months of this year of 7,251 units.  EV's have a long way to go before they reach general acceptance outside politicians, academics and true believers.