In the end of 2015, China had 170.000 of the 173.000 ebuses circulating in the World.
Just focusing on all-electric Buses, sales grew to 115.700 units in 2016.
With this kind of growth and market share, it is expected that China goes all-electric in this category in less than 10 years, maybe five, so it is no wonder that large cities like Shenzen are already envisioning an all-electric 15.000 fleet of Buses... in 2017.
https://ev-sales.blogspot.com/2017/01/china-buses-2016.html [blogspot.com]