Source: L. 69: R&RE, p. 695, § 1. C.R.S. 1963: § 86-6-5. L. 83: (1) R&RE, p. 1230, § 18, effective July 1; (1) amended, p. 880, § 18, effective July 1. L. 88: IP(1)(a), (1)(a)(I), (1)(a)(II), and (2) amended, p. 1257, § 6, effective July 1. L. 91: (1)(b) amended, p. 709, § 6, effective July 1. L. 93: (1)(b) amended, p. 439, § 6, effective July 1. L. 99: (1)(c) amended, p. 754, § 25, effective January 1, 2000. L. 2001: (1)(c) and (2) amended, p. 1432, § 13, effective July 1.