How many people bet on the horse that won the Kentucky Derby?

I was at the Kentucky derby on saturday May 2 and i am telling you that horse Mind that Bird Shut the grandsstands up. for ten minutes nobody said a word we were all shocked. But i loved it because he was a underdog. and the owners and trainer after they won the roses went over to the Statue of Barbaro and laid them on the statue and one by one gave all the Fans of Barbaro a rose, Now that was the nicest thing i have ever heard what a heart they have.