Source: L. 64: p. 601, § 12. C.R.S. 1963: § 123-31-12. L. 73: p. 595, § 62. L. 74: (1) and (4) R&RE, p. 370, § 5, effective March 21. L. 84: (4)(a) and (4)(b) amended, p. 593, § 1, effective March 26. L. 87: (1) amended, p. 313, § 43, effective July 1. L. 92: Entire article amended, p. 823, § 31, effective January 1, 1993.