I estimated. Pick say the debian reository, and count them there. Pick all of the programs written in Haskell where somebody as pointed you to them and said "this is cool and solves a problem you might have" where that proglem is something more than writing a haskell program.

I'm not omniscient, funnily enough. But hey, let's ask. How many programs have you written in haskell that you've published and have more than say 10,000 users?