The state shall contribute the following percentages of the salary of each member covered by state general member coverage plan 3 starting with the first pay period that ends within the calendar month in which state general member coverage plan 3 becomes applicable to the member:
A. beginning July 1, 2020 and continuing through June 30, 2021, seventeen and seventy-four hundredths percent of salary;
B. beginning July 1, 2021 and continuing through June 30, 2022, eighteen and twenty-four hundredths percent of salary;
C. beginning July 1, 2022 and continuing through June 30, 2023, eighteen and seventy-four hundredths percent of salary; and
D. beginning July 1, 2023 and thereafter, nineteen and twenty-four hundredths percent of salary.