The affiliated public employer shall contribute the following percentages of the salary of each member it employs and who is covered under municipal police member coverage plan 4:
A. prior to July 1, 2022, nineteen and fifteen-hundredths percent of salary;
B. beginning July 1, 2022 and continuing through June 30, 2023, nineteen and sixty-five hundredths percent of salary;
C. beginning July 1, 2023 and continuing through June 30, 2024, twenty and fifteen-hundredths percent of salary;
D. beginning July 1, 2024 and continuing through June 30, 2025, twenty and sixty-five hundredths percent of salary; and
E. beginning July 1, 2025 and thereafter, twenty-one and fifteen-hundredths percent of salary.