"Although there are no accurate or even near accurate census records for dogs in the U.S., in some populations pit bulls are estimated to comprise some 30-40% of the dog population, making it by FAR the most popular breed. Considering that there are an estimated 53,000,000 dogs in the U.S., and assuming that pit bulls make up 20% of that population, there would be approximately 10,600,000 pit bulls in our society. In 1998, five pit bulls were involved in 2 fatal attacks."
That is roughly ONE dog out of 2,120,000 - or .00004716 percent of the pit bull Population.