The State Board shall certify to the Director of the Office of Management and Enterprise Services, the Speaker of the House of Representatives, and the President Pro Tempore of the Senate, on or before July 15 of each year, an actuarially determined estimate of the rate of contribution which will be required, together with all accumulated contributions and other assets of the System to pay by level-dollar payments all liabilities which shall exist or accrue pursuant to the provisions of the System, including amortization of the unfunded accrued liability over a period of not to exceed thirty (30) years beginning July 1, 2014.