A member under municipal general member coverage plan 4 shall contribute fifteen and sixty-five hundredths percent of salary starting with the first full pay period in the calendar month in which municipal general member coverage plan 4 becomes applicable to the member, except that a member whose annual salary is greater than twenty-five thousand dollars ($25,000) shall contribute:
A. prior to July 1, 2022, seventeen and fifteen hundredths percent of salary;
B. beginning July 1, 2022 and continuing through June 30, 2023, seventeen and sixty-five hundredths percent of salary;
C. beginning July 1, 2023 and continuing through June 30, 2024, eighteen and fifteen hundredths percent of salary;
D. beginning July 1, 2024 and continuing through June 30, 2025, eighteen and sixty-five hundredths percent of salary; and
E. beginning July 1, 2025 and thereafter, nineteen and fifteen hundredths percent of salary.