Wikipedia said its the top selling car in it's category:
> Global sales since mid-2014 totaled more than 10,000 BMW i8s by early November 2016, making the i8 the world's top selling plug-in electrified sports car. The top selling markets are the United States, the United Kingdom and Germany.
This is pretty surprising. What do they get out of doing this? It's competitively valuable market information but I don't see why customers would benefit from knowing the exact numbers - so I don't get why they do this.
Investors expect this information so if they stopped it would be assumed they were hiding bad numbers. Further the information will trickle out in the form of car registration statistics anyways so they aren't giving you anything you couldn't get elsewhere.