(As added Apr. 30, 1951, eff. Aug. 1, 1951; amended Jan. 21, 1963, eff. July 1, 1963; Apr. 29, 1985, eff. Aug. 1, 1985; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 25, 1988, eff. Aug. 1, 1988; Pub. L. 100–690, title VII, § 7050, Nov. 18, 1988, 102 Stat. 4401; Apr. 22, 1993, eff. Dec. 1, 1993; Mar. 27, 2003, eff. Dec. 1, 2003; Apr. 30, 2007, eff. Dec. 1, 2007; Mar. 26, 2009, eff. Dec. 1, 2009.)