Percent of rzrs that have flopped, rolled, ect

I am a new xp1000 owner, and after a few days and >100miles the rzr ended up gently on its side. It was so slow and gentle that you wouldn’t know it by looking at the machine unless I told you it happened. It got me wondering, roughly what percent of machines get rolled, and what is the most common cause. I wasn’t driving mine when it happened… I leg a friend drive and he tried a donut in the wrong place… Caught a rock funny. I had also aired down from 15-12 which didn’t help either.