Source: L. 67: p. 767, § 1. C.R.S. 1963: § 57-8-4. L. 70: p. 196, § 1. L. 73: p. 1648, § 9. L. 77: (2)(n) and (2)(o) amended, p. 827, § 2, effective July 1. L. 79: (2)(u) amended, p. 656, § 20, effective July 1. L. 81: (2)(ee) amended, p. 1885, § 6, effective May 27; (2)(g)(I) and (2)(g)(II) amended, p. 631, § 8, effective July 1. L. 92: (2)(gg) added, p. 1991, § 1, effective April 16. L. 95: (2)(x) amended, p. 312, § 3, effective July 1. L. 99: (2)(hh) added, p. 70, § 1, effective August 4. L. 2002: (2)(ii) added, p. 650, § 3, effective July 1.