The determination of the percentage to be transferred to funds to be used for governmental functions as provided in Kan. Stat. Ann. § 13-1271, and amendments thereto, shall be determined by the governing bodies or operating or managing boards, as the case may be, of the utilities of such cities, within the range of percentages shown in Kan. Stat. Ann. § 13-1271, and amendments thereto. The determination of the percentage to be transferred shall be made by the board of public utilities on or before the first day of May of the preceding year and the board shall notify the governing body of the city of such determination by such date. If the board fails to determine the percentage or fails to notify the governing body of the city before the first day of May of any year, the board shall transfer over a percentage which shall be no less than the percentage transferred in the preceding year.