http://mobile.nytimes.com/2012/04/0...-policies-change-with-laws.html?referer=&_r=0
After California voters approved such a law, black and Hispanic freshman enrollment at the University of California system dropped by about one-quarter in 1998, the first year the ban was in effect. At the system’s most competitive campuses, in Berkeley and Los Angeles, enrollment for those groups fell by almost half.
In the years since, the system has tried several approaches to increase diversity without directly taking race into account, and the numbers eventually rose.
Black students accounted for just over 4 percent of University of California freshmen in the mid-1990s. That fell to 3 percent after the law took effect, and remained there for several years, before climbing close to 4 percent in recent years.