You can find the data for calendar year 2012, including the chart above, at http://compensation.universityofcalifornia.edu/payroll2012/. [Click on the chart to enlarge it.] Among the interesting figures is that about one eighth of payroll goes to ladder faculty, another eighth to other instructors, and about 6% to TAs. By the way, if you don’t want to be in the database, apparently you need to become a student for part of the year:
Pursuant to federal student privacy laws, the names of all employees who were UC students (including medical residents) at any point during a given calendar year have been redacted and appear as ******. Source: https://ucannualwage.ucop.edu/wage/.