There is no such data available. Its all anonymous
Exactly, I can hardly think of any person who can tell you the exact statistics in this regard. There is no one out of us who actually knows this things. According to my knowledge, the number of investors who are investing their capita in ICOs is not that much significant figure as compared to that of bitcoin but things are getting in favor of ICO with each passing day. You can hope for some positive results in near future.