I'd be curious what the mixed breeds are, but there's probably no surprises there.
In the 15-year period of 2005 through 2019, canines killed 521 Americans. Pit bulls contributed to 66% (346) of these deaths. Combined, pit bulls and rottweilers contributed to 76% of the total recorded deaths.
https://www.dogsbite.org/dog-bite-statistics-fatalities-2019.php
I'd be curious about 'per capita' as well. What I see in the street, the percentage seems very high.