Dec 31, 1989

Nov 01, 1991

Dec 01, 1992

Dec 31, 1993

Dec 31, 1994

Jan 01, 1996

Jun 01, 1996

Feb 01, 1998

Oct 31, 1999

Nov 01, 1999

Dec 02, 2004

Oct 13, 2005

Mar 02, 2006

Jun 07, 2007