This web site can show pay levels of UC alumni by campus, major, and year of graduation (within two year periods starting at 1999-2000). This data comes from the California EDD, so it only includes those working in California, excluding those who are self-employed or working for the national government. The pay levels for past years are adjusted for inflation.
They also need to adjust it for geography. A person making $100k in the LA area would need $135k in the Bay.