It looks like the median/mode is 1-2 car accidents (50% of drivers), and the average is 3-4. 25% of drivers have no accidents (as far as insurance companies are concerned, ie, no claims or police reports).

I'm curious how this looks with various ways of normalizing for amount driven; is that no-accident crowd the quartile of drivers who don't drive very much? The biggest factor in being in the opposite group (the 10% of drivers with 50% of accidents) is "drive all the time, commercially or otherwise".