В копилку Сарказму
Вдогонку к http://www.livejournal.com/users/capka3m/156963.html, http://www.livejournal.com/users/capka3m/157471.html и http://www.livejournal.com/users/capka3m/157854.html:

The annual rate for whites averaged 8.13 homicides per 100,000 population from 1976 through 1987 and then climbed rapidly, almost doubling in the next four years, from a rate of 7.6 per 100,000 in 1987 to 13.6 in 1991. The rates for African-American males more than doubled in those four years, from 50.4 in 1987 to 111.8 in 1991, and tripled from 32.0 per 100,000 in 1984 to 111.8 in 1991.

http://www.saf.org/LawReviews/Blumstein1.htm