April 13, 1999	1.5.2
September 5, 2000	1.6
October 16, 2000	2.0
April 17, 2001	2.1
December 21, 2001	2.2
July 29, 2003	2.3
November 30, 2004	2.4
September 16, 2006	2.5
October 1, 2008	2.6
December 3, 2008	3.0