Prop 209, approved by voters in 1996, banned affirmative action in university admissions and public contracting. It followed an earlier move in 1995 by the Regents to ban affirmative action and, in fact, made their decision redundant. (They later revoked the decision, an action that had no effect once Prop 209 was enacted.) The Contra Costa Times has a retrospective article on the subject because of the pending U.S. Supreme Court decision on affirmative action that could extend to private as well as public universities since the former accept federal funding. The chart above comes from that article and focuses on admission rates at UC-Berkeley.
The article is at http://www.contracostatimes.com/breaking-news/ci_23516741/affirmative-action-ban-at-uc-15-years-later
You can see a video of the Regents’ action at the link below: