Source: L. 65: p. 862, § 7. C.R.S. 1963: § 88-6-7. L. 69: p. 698, § 3. L. 89: (3) amended, p. 1259, § 9, effective May 2. L. 98: (3) amended, p. 141, § 3, effective August 5. L. 2017: (1) and (2) amended, (SB 17-294), ch. 264, p. 1413, § 103, effective May 25.