In addition to the exemptions provided and authorized in this section, subject to statutory authorization, the governing body of a county by ordinance may impose a sales and use tax in order to exempt all or a portion of the value of private passenger motor vehicles, motorcycles, general aviation aircraft, boats, and boat motors from property taxes levied in the county. This exemption, or its subsequent rescission, is allowed only pursuant to a referendum held in the county in the manner that the General Assembly provides by law.