An affiliated public employer shall contribute the following percentages of the salary of each member it employs and who is covered under municipal general member coverage plan 4:

A. prior to July 1, 2022, twelve and three-tenths percent of salary;

B. beginning July 1, 2022 and continuing through June 30, 2023, twelve and eight- tenths percent of salary;

C. beginning July 1, 2023 and continuing through June 30, 2024, thirteen and three- tenths percent of salary;

D. beginning July 1, 2024 and continuing through June 30, 2025, thirteen and eight- tenths percent of salary; and

E. beginning July 1, 2025 and thereafter, fourteen and three-tenths percent of salary.