i dont think such a thing exists.
You just fell into all the russians :p.
But Russia is a very big country so it isn't a surprise if a big amount of btc users are from there
It doesn't realy matter anyway if the major percentage of bitcoin users come from russia. What would matter even is which country holds the most amount of bitcoins and apparently, that goes to china (as far as I know) because that would have the capability to somehow affect the value of bitcoin if they do a collab dump/pump.