There shall be apportioned and paid by the state annually to each school district employing a supervisor of adult education an amount equal to two thirds of the supervisor's annual salary; provided that in no case shall payment by the state exceed $12,000.00. In the case of districts employing a part-time supervisor, the salary of such supervisor shall be proportionate to the ratio such part-time employment bears to full-time employment, such applicable ratio to be established in each instance by the commissioner.
N.J.S. § 18A:50-7