A member who has twenty-five or more years of service credit shall receive annual disability benefits, payable in twelve monthly installments, in an amount equal to a percentage of the member's average annual salary. The percentage shall be the sum of two and one-half per cent for each of the first twenty years of service credit, plus two per cent for each of the twenty-first to twenty-fifth years of service credit, plus one and one-half per cent for each year in excess of twenty-five years of service credit. The annual disability benefit shall not exceed seventy-two per cent of the member's average annual salary.
In calculating a benefit under this division, a member's average annual salary shall be determined using three years of contributions if, as of July 2, 2013, the member had fifteen or more years of service credit. If, as of that date, the member had less than fifteen years of service credit, the average annual salary shall be determined using five years of contributions.
R.C. § 742.39