According to the Illinois Department of Transportation’s (IDOT) “2009 Illinois Crash Facts & Statistics” (pdf) in 2009 (the latest year available) there were 3846 motorcycle accidents and 124 fatal motorcycle accidents.
As stated on page 21:
Motorcycle crashes account for 1.3 percent of all crashes in the year 2009. The number of motorcyclists killed decreased by 3.7 percent, from 135 in 2008 to 130 in 2009. These motorcycle fatalities account for 14.3 percent of all fatalities in 2009.
Also seen on page 21, more than half (2144) of the 3977 motorcycle crashes occurred when the motorcyclist was “Going Straight Ahead” at the time of the accident.