§ 59. Bond reserve insurance fund. The agency shall create and establish a special fund, to be known as the bond reserve insurance fund and shall pay into such fund all monies appropriated and made available by the state for the purposes of such fund and any other monies which may be made available to the agency for the purposes of such fund from any other source or sources. All monies held in the bond reserve insurance fund shall be used by the agency to meet the agency's obligation to repay principal and interest on its outstanding bonds, solely to the extent all other revenues of the agency available for such purposes are not sufficient to meet such obligations of the agency. Any income or interest earned by, or increment to the bond reserve insurance fund may be used for authorized purposes including, but not limited to, the addition of such income or interest earned, or increment to the monies held in such fund for the purposes herein provided, or the repayment of appropriation expenditures made to the credit of such fund.