The department shall at all times, so long as any of the debentures are outstanding, establish, fix, and collect interest at the rate or rates, which may be fixed interest rates or variable interest rates, on the unpaid balance on all pledged contracts to produce an amount that, together with income derived from investments, will yield revenues that will, in the aggregate, be sufficient with respect to the then immediately ensuing fiscal year to pay and provide for all of the following:
(a) Interest to become due and payable in that fiscal year on all debentures.
(b) The principal amount of all serial debentures maturing by their terms during that fiscal year.
(c) The aggregate minimum sinking fund payments, if any, required to be made for that fiscal year on account of debentures then outstanding.
(d) Those sums as may be required as reserve fund payments due in that fiscal year.
(e) The estimated expenses of maintenance, operation, and administration of the department as provided in the budget of the department for that fiscal year.
(Amended by Stats. 1998, Ch. 530, Sec. 6. Effective September 17, 1998.)