Source: L. 69: R&RE, p. 694, § 1. C.R.S. 1963: § 86-6-2. L. 88: Entire section amended, p. 1255, § 3, effective July 1. L. 99: (2) amended and (2.5) added, p. 752, § 23, effective January 1, 2000. L. 2001: (2) and (2.5) amended, p. 1431, § 11, effective July 1.