In addition to any other taxes which the City of New Orleans is now or may hereafter be authorized to levy, said city may levy annually, beginning with the year 1963, a special tax in the amount of one-half (1/2) of one mill on the dollar, on all taxable property in said city which is assessed and valued for city taxation purposes. The avails of such tax shall be paid into the general fund of the city to be used for general municipal purposes.
La. Const. A. § 14-25.1