I think what's clear is that it's independent of the change in the law that occurred in June of 1982. What we see toward the end of the 1980s in California is actually what you see across the United States during that period of time, which was that from the mid to late 1980s up until the early 1990s, there was an increase, and you're seeing that in California.
In this particular context, obviously the focus is largely on what was happening around the time of 1982, because Levitt's main argument is that there's a drop from 1981 to 1983 as a result of the change in law and what you see is a pre-existing trend.