(A) For all purposes of this title, the assumed annual rate of return on the investments of the Retirement System must be established by the General Assembly pursuant to this section. Effective July 1, 2017, the assumed annual rate of return on retirement system investments is seven and one quarter percent.

(B) The assumed rate of return set in subsection (A) expires on July 1, 2021. A new annual rate of return must be set and made effective no later than July 1, 2021, and, every four years after, a new annual rate must be set and made effective. Before January first of each year that the assumed rate of return is due to expire, the board shall submit a proposed assumed annual rate of return for the corresponding four-year period. The proposed assumed annual rate of return must be developed based on the recommendations of the board’s actuary and in consultation with the commission, and must be submitted to the Chairman of the Senate Finance Committee and the Chairman of the House Ways and Means Committee. If the General Assembly does not enact a joint resolution that continues or amends the assumed annual rate of return before expiration, the assumed annual rate of return developed and submitted by the board takes effect for the corresponding four-year period until subsequent action of the General Assembly.