Whenever any bond or bonds have been issued under this subchapter, the Kent County Levy Court shall annually raise by levy and taxation a sum sufficient for the payment of the interest on the amount or amounts borrowed and shall likewise raise from time to time by levy and taxation such sum or sums as shall be necessary to establish a sinking fund for the payment of the debt secured by the bond or bonds at or before the maturity thereof. The sums authorized to be raised for interest and for a sinking fund shall be raised in the same manner as the county library tax is raised and shall be in addition to all sums authorized to be raised by the County by any other statute. If the improvements for which bonds are sold are for the benefit of a library district, only the real property in that library district shall be taxed.