Version 1 (effective June 25, 2008 to September 29, 2008)
Version 2 (effective September 30, 2008 to April 20, 2009)
Version 3 (effective April 21, 2009 to November 26, 2009)
Version 4 (effective November 27, 2009 to April 8, 2010)
Version 5 (effective April 9, 2010 to November 23, 2010)
Version 6 (effective November 24, 2010 to March 28, 2011)
Version 7 (effective March 29, 2011 to December 5, 2011)