Section 8392 - Actuarial valuations and appropriations(a) The actuary shall prepare an actuarial valuation of the assets and liabilities of the funds as of June 30, each year. On the basis of reasonable actuarial assumptions and tables approved by the Board, the actuary shall determine the normal cost required to meet the actuarial cost of current service and the unfunded actuarial accrued liability.(b) The State's appropriation to the funds for fiscal year 2008, and for each fiscal year thereafter, shall be the percentage of covered payroll approved by the Board on the basis of the most recent actuarial valuation, and shall equal the sum of the normal cost plus the payment required to implement the provisions of subsection (c) of this section plus the payment required to amortize the unfunded actuarial accrued liability using an open amortization period of 20 years. The amortization payment shall be an amount computed as a level percentage of the prospective total covered payroll over the remainder of the amortization periods, with such prospective total covered payroll to be determined on the basis of a growth rate, as determined by the Board, compounded annually. Except as provided in subsection (c) of this section, all funds appropriated pursuant to this subsection shall be deposited into the Fund established by § 8393 of this title.(c) In order to provide a fund for post retirement increases, the State shall include in its annual appropriation payments equal to 2.33% of covered payroll, subject to the limitations contained in § 5548(a)(2) of Title 29. Beginning with the fiscal year 94 budget, .70% of covered payroll shall be appropriated; in fiscal year 95, 1.11% of covered payroll shall be appropriated; in fiscal year 96, 1.52% of covered payroll shall be appropriated; in fiscal year 97, 1.93% of covered payroll shall be appropriated; in fiscal year 98 and each fiscal year thereafter 2.33% of covered payroll shall be appropriated. Funds appropriated to implement this subsection shall be deposited into the Post Retirement Fund established by § 5548 of Title 29.69 Del. Laws, c. 104, §3; 76 Del. Laws, c. 80, § 68; 78 Del. Laws, c. 116, § 6.;