CA Gov't Code Section 75520

(a)

A judge shall, monthly, accrue monetary credits equal to 18 percent of the judge’s monthly salary.

(b)

To the total monetary credits in each judge’s account, an additional amount shall be credited monthly at a rate, not less than zero, equal to the annual net earnings rate achieved by the Judges’ Retirement System II Fund on its investments of moneys in the Judges’ Retirement System II Fund during the preceding fiscal year.