(As amended Apr. 24, 1972, eff. Oct. 1, 1972; Apr. 22, 1974, eff. Dec. 1, 1975; Pub. L. 94–64, § 3(4), July 31, 1975, 89 Stat. 370; Pub. L. 94–149, § 5, Dec. 12, 1975, 89 Stat. 806; Apr. 30, 1979, eff. Aug. 1, 1979; Apr. 28, 1982, eff. Aug. 1, 1982; Apr. 22, 1993, eff. Dec. 1, 1993; Apr. 29, 2002, eff. Dec. 1, 2002; Apr. 26, 2011, eff. Dec. 1, 2011.)