The most recent statistics document from the NHTSA that I have been able to find is from 2007:
http://www.nhtsa.dot.gov/portal/nhts...007/810990.pdf
They say, amongst other things
Per vehicle mile traveled in 2006, motorcyclists were about 35 times more likely than passenger car occupants to die in a motor vehicle traffic crash and 8 times more likely to be injured.
Per registered vehicle, the fatality rate for motorcyclists in 2006 was 5.5 times the fatality rate for passenger car occupants. The injury rate for motorcyclists was 1.2 times the injury rate for passenger car occupants.
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