(As amended Feb. 28, 1966, eff. July 1, 1966; Dec. 4, 1967, eff. July 1, 1968; Mar. 1, 1971, eff. July 1, 1971; Apr. 28, 1982, eff. Aug. 1, 1982; Apr. 29, 1985, eff. Aug. 1, 1985; Mar. 9, 1987, eff. Aug. 1, 1987; Apr. 29, 2002, eff. Dec. 1, 2002; Apr. 25, 2005, eff. Dec. 1, 2005; Apr. 30, 2007, eff. Dec. 1, 2007; Apr. 23, 2008, eff. Dec. 1, 2008; Mar. 26, 2009, eff. Dec. 1, 2009; Apr. 28, 2016, eff. Dec. 1, 2016; Apr. 26, 2018, eff. Dec. 1, 2018.)