(As amended Dec. 27, 1946, eff. Mar. 19, 1948; Jan. 21, 1963, eff. July 1, 1963; Dec. 4, 1967, eff. July 1, 1968; Mar. 1, 1971, eff. July 1, 1971; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 30, 1991, eff. Dec. 1, 1991; Apr. 23, 2001, eff. Dec. 1, 2001; Apr. 30, 2007, eff. Dec. 1, 2007; Apr. 25, 2014, eff. Dec. 1, 2014.)