Hmmm i've never heard exact numbers but a lot of people switch to the plastic bumpers for that reason. The rear is hard to do though. And call me nuts but I appear to be the only person on the planet that LIKES the way the "diving board" bumpers look. Those puppies are staying on!
1984 318i 5-spd that's not currently registered... project car.
1998 Subaru Legacy Sedan
1996 Nissan Maxima is the girlfriend's car that was glad to meet somebody who knew what "routine maintenance" was.