Oct 01, 1981

Nov 01, 1982

Dec 31, 1982

Dec 31, 1986

Aug 01, 1987

Sep 01, 1990

Dec 31, 1991

Feb 01, 1992

Mar 31, 1993

Dec 31, 1993

Dec 31, 1993

Dec 31, 1993

Dec 31, 1993

Dec 31, 1993

Jun 27, 1994

Jul 10, 1994

Oct 31, 1995

Dec 31, 1997

Sep 01, 1999

Jun 20, 2000

Apr 29, 2002

Aug 16, 2002

Jan 05, 2003

Mar 18, 2003

Mar 16, 2004

Dec 31, 2004

Oct 15, 2010

TBD