An excise tax is imposed on the storage, use or other consumption in the city of tangible personal property purchased from any retailer at the rate of 0.875 percent tax from July 1, 1956 to and including June 30, 1968; to impose a 0.900 percent tax on or after July 1, 1968 to and including June 30, 1969; to impose a 0.925 percent at on or after July 1, 1969 to and including June 30, 1970; to impose a 0.950 percent tax on or after July 1, 1970 to and including September 30, 1984; and to impose a 0.975 percent tax on or after October 1, 1984, and each and every year thereafter of the sales price of the property. The sales price shall include delivery charges when such charges are subject to state sales or use tax regardless of the place to which delivery is made. (Ord. 1587 NCS §3, 1984; Ord. 891 NCS §3; Ord. 619 NCS §§5, 6; Ord. 444 NCS §5; prior code §23.9(a).)