The annual fee for registration of a tractor, except farm tractors as otherwise provided in this chapter, shall be based on the actual weight of such tractor at the same rate as that provided for trucks of like weight under the provisions of this chapter. The minimum fee for registering any tractor shall be $20.00. (Amended 1964, No. 19 (Sp. Sess.), § 3, eff. March 9, 1964; 1975, No. 213 (Adj. Sess.), § 1, eff. April 1, 1976; 1981, No. 87, § 11; 1989, No. 51, § 21; 2001, No. 139 (Adj. Sess.), § 5; 2015, No. 158 (Adj. Sess.), § 79.)