(As amended Feb. 28, 1966, eff. July 1, 1966; Apr. 30, 1979, eff. Aug. 1, 1979; Apr. 28, 1983, eff. Aug. 1, 1983; Pub. L. 98–473, title II, § 215(b), Oct. 12, 1984, 98 Stat. 2015; Apr. 29, 1985, eff. Aug. 1, 1985; Pub. L. 99–570, title I, § 1009(a), Oct. 27, 1986, 100 Stat. 3207–8; Apr. 30, 1991, eff. Dec. 1, 1991; Apr. 24, 1998, eff. Dec. 1, 1998; Apr. 29, 2002, eff. Dec. 1, 2002; Apr. 26, 2004, eff. Dec. 1, 2004; Apr. 30, 2007, eff. Dec. 1, 2007; Mar. 26, 2009, eff. Dec. 1, 2009.)