That data is oldy moldy and WAY off from current numbers. See the study (linked below) from 2001 which shows that is no longer the case. It's about page 13. But basically in 1999 Fatalities by Engine displacement are below. If you look at the report you will notice that the fatalities for 500cc and less has gone down consistently each year from 17% in 1990 to 6% in 1999.
Up to 500: Total # 73, Percentage: 6%
501-1,000: Total# 455, Percentage: 40%
1,001-1,500: Total # 372, Percentage: 33%
1,500 and up: Total # 12, Percentage: 1%
Unknown CCs: Total# 228, Percentage:20%
Total 1140 Fatalities
That report has all sorts of great statistics for 1990-1999. The publication is distributed by the U.S. Department fo Transportation, National Highway Traffic Safety Administration.
http://www.webbikeworld.com/Motorcyc...ty/809-360.pdf