The city council or village board of trustees shall each year until the bonds issued under the authority of section 17-967 be paid, levy upon the taxable property in the city of the second class or village, a tax sufficient to pay the interest and five percent of the principal as a sinking fund; and at the tax levy preceding the maturity of any such bonds, levy an amount sufficient to pay the principal and interest due on such bonds.
Neb. Rev. Stat. §§ 17-969