Any judge retiring pursuant to subdivision (1) of subsection (a) of Section 12-18-55 who has served for 10 years shall be entitled to a disability benefit allowance payable monthly from the Judicial Retirement Fund equal to 75 percent of the salary payable to the state for the position held at the time of retirement. A disabled judge who has served less than 10 years shall be entitled to receive a monthly benefit equal to 25 percent of the salary payable by the state for the position held at the time of retirement plus 10 percent of such salary for each year of service in excess of five years; provided, that in no event shall such judge receive less than 30 percent of the annual salary being paid to a full-time district court judge by the state at the time of his retirement.