I must have missed where you linked the source for that.
Do you have it handy?
The High risk industry has lobbied to keep the Government for maintaining such stats. I got 15 from actually counting them up on google one day. Good Luck.
The 4.8 million is constantly bantied about by solosmoke and it's been published on a few pit activist sites. We both know no one has any idea of the population with the back yard breeders and the massive number of pits being euthanized in the shelters.
Los Angeles alone "processes" 800 pit bulls a week, yet the blood sucking breeders keep cranking them out.
http://www.muttshack.org/MuttShack_news-pitbull.htm