Here you go, you ****ing idiot. First thing that pulled up in my search, took all of a second and a half:
https://www.avma.org/KB/Resources/LiteratureReviews/Pages/The-Role-of-Breed-in-Dog-Bite-Risk-and-Prevention.aspx
There are countless others. Maybe if you read it, it will clue you into the fact that there are other factors, besides breed, that are a bigger influence in the number of attacks attributed to pit bulls.