GOV §31681.5: Every retirement allowance payable for time commencing on the effective date of this section to, or on account of any member of this system or of a superseded system, who has been retired for service,

Every retirement allowance payable for time commencing on the effective date of this section to, or on account of any member of this system or of a superseded system, who has been retired for service, is hereby increased as follows: Percentage of Period during which increase in retirement became effective monthly retirement allowance On or prior to June 30, 1956 10% Twelve months ended June 30, 1957 8% Twelve months ended June 30, 1958 6% Twelve months ended June 30, 1959 4% Twelve months ended June 30, 1960 2% In no event shall any allowance be increased by an amount greater than fifty dollars ($50) a month nor less than ten dollars ($10) a month. This section shall not be operative in any county until such time as the board of supervisors shall, by ordinance adopted by majority vote, make the provisions of this section applicable in such county.