How many MT4 customers are there in the world?

 

Any way we can guess how many total customers there are in the world using MT4, demo, live, active, etc.?

Of course brokers do not publish 100% of their data but maybe there is some way to obtain this information through MetaQuotes or by using some interpolation / analysis of existing data.

 
That'd be interesting to find a total number of users but will probably not happen.