Cal. Rev. & Tax. Code § 35
Commencing with its January 1, 1985, population base and continuing until the date of certification of the 1990 Federal Census, the population to be used by the Controller and by all other state and county agencies for all purposes of allocation and distribution of grant funds and subventions, including, without limitation, the annual allocation from the Public Library Fund and from the Motor Vehicle License Fee Account in the Transportation Tax Fund, for any general law city located in a county of the 11th class, which city's population as of January 1, 1985, was 38,925 based upon an estimate validated by the Department of Finance, shall be 38,925, adjusted annually, commencing January 1, 1986, by the percentage of population growth of the State of California as a whole.
Ca. Rev. and Tax. Code § 35