On or before July 15, 1987, and on or before January 15 of each year thereafter, the county clerk shall prepare and forward to the county appraiser, director of property valuation and the state-assessed public utilities located in the county which are valued and assessed pursuant to Kan. Stat. Ann. § 79-5a01 et seq., and amendments thereto, a taxing unit map showing the number and metes and bounds of every taxing unit or any portion of a taxing unit located within the county as the same exists on December 31 of the preceding year. In any year that such map would be identical to the most recently furnished map, the county clerk shall so certify in writing on or before January 15 in lieu of forwarding such map.