Any moneys in the registration fund accruing from license fees or from other like sources, in excess of the amount required to pay salaries and other necessary expenses, in accordance with the legislative assembly’s appropriation for such purposes, must be promptly deposited in the highway tax distribution fund which must be distributed in the manner as prescribed by law. The state treasurer shall transfer annually from the highway tax distribution fund to the ethanol production incentive fund an amount equal to forty percent of all sums collected for the registration of farm vehicles under subsection 5 of section 39-04-19 except that no transfer may be made in an amount that would result in the balance of the ethanol production incentive fund exceeding seven million five hundred thousand dollars.