Changes in the boundaries of districts shall be made by ordinance in the manner provided in Chapter 17.36, the ordinance describing the area to be changed either by lot and block number, or by metes and bounds. After adoption of any ordinance changing any boundaries of any district, the city clerk shall mark the aforementioned map to show the number and date of the adoption of the ordinance making such change. One year after the adoption of the ordinance codified in this title, and annually thereafter, the city clerk shall cause a revised zoning map to be published in a newspaper of general circulation in the city, the map to show the changes made in district boundaries effected by amending ordinances as provided in this section for the year preceding the publication; provided, however, that no publication shall be required if there have been no such changes during the preceding year. (Ord. 91-1 § 5, 1991; Ord. 3-83 § 3.5, 1983)