Deposits of employer contributions into the pension stabilization reserve trust fund as provided in § 8-36-920 shall be suspended effective July 1 of any given year next following the most recent actuarial valuation conducted pursuant to § 8-36-922(b) for an employer whose stabilization reserve trust account equals or exceeds a certain maximum amount that is determined by the trustees of the trust created pursuant to this part. The amount shall be expressed in dollars, as a percentage, or other form as shall be determined at the sole discretion of the trustees. The trustees, in consultation with board of trustees of the Tennessee consolidated retirement system and the retirement system's actuary, shall establish the methodology and procedures to be used in ascertaining the maximum amount. Deposits into the pension stabilization reserve trust fund shall be reinstated for the employer effective July 1 of any given year next following the most recent actuarial valuation conducted pursuant to § 8-36-922(b) when the total amount in the employer's stabilization reserve trust account is less than the maximum amount adopted by the trustees pursuant to this section.