(As amended Jan. 21, 1963, eff. July 1, 1963; Mar. 30, 1970, eff. July 1, 1970; Apr. 29, 1980, eff. Aug. 1, 1980; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 30, 1991, eff. Dec. 1, 1991; Apr. 22, 1993, eff. Dec. 1, 1993; Apr. 23, 1996, eff. Dec. 1, 1996; Apr. 17, 2000, eff. Dec. 1, 2000; Apr. 23, 2001, eff. Dec. 1, 2001; Apr. 12, 2006, eff. Dec. 1, 2006; Apr. 30, 2007, eff. Dec. 1, 2007; Apr. 26, 2018, eff. Dec. 1, 2018.)