Notwithstanding any other provision of law, in no event shall an allowance payable pursuant to this chapter to a retired member on the effective date of a reduction in judges’ salaries ever be reduced to an amount less than the amount produced by multiplying the amount of the highest salary the retired member was paid while serving as a judge by the following percentages:
(a) For an allowance computed pursuant to Section 75032, 50 percent.
(b) For an allowance computed pursuant to the first clause of subdivision (a) of Section 75076, 65 percent.
(c) For an allowance computed pursuant to the second clause of subdivision (a) of Section 75076, 75 percent.
(d) For an allowance computed pursuant to Section 75033 or 75033.5, the percentage used to calculate the original retirement allowance pursuant to Section 75033 or 75033.5.