All certificates of indebtedness are and shall be issued upon the full faith and credit of the county, which is hereby pledged to the punctual payment of the principal thereof and interest thereon, and they shall be payable from unlimited ad valorem taxes levied upon all assessable property within the corporate limits of the county and the resolution of the council authorizing the issuance of such certificates shall so provide. In each and every fiscal year that any such certificates are or will be outstanding, the county and the council shall levy or cause to be levied ad valorem taxes upon all the assessable property within the corporate limits of the county in rate and amount sufficient to provide for the payment, when due, of the interest and principal of all such certificates becoming due in such fiscal year. In the event the proceeds from the taxes levied in any such fiscal year shall prove inadequate for such payment, additional taxes shall be levied in the succeeding fiscal year to make up any such deficiency. (Mont. Co. Code 1965, § 5-8; 1978 L.M.C., ch. 36, § 1.)