Pub. L. 110–234 and Pub. L. 110–246 made identical amendments to this section. The amendments by Pub. L. 110–234 were repealed by section 4(a) of Pub. L. 110–246.

2018—Subsec. (a). Pub. L. 115–334 substituted “2019 through 2023” for “2008 through 2018”.

2014—Subsec. (a). Pub. L. 113–79 substituted “2018” for “2012”.

2008—Subsec. (a). Pub. L. 110–246, § 6025(a), substituted “2008 through 2012” for “2001 through 2007”.

2002—Subsec. (a). Pub. L. 107–171 substituted “2007” for “2002”.

Amendment of this section and repeal of Pub. L. 110–234 by Pub. L. 110–246 effective May 22, 2008, the date of enactment of Pub. L. 110–234, see section 4 of Pub. L. 110–246, set out as an Effective Date note under section 8701 of this title.