Dec 31, 1986

Feb 01, 1987

Jul 01, 1987

Oct 01, 1987

Feb 01, 1988

Dec 31, 1988

Aug 01, 1990

Oct 01, 1991

Dec 31, 1991

Dec 31, 1991

Feb 01, 1992

Dec 31, 1993

Dec 31, 1993

Dec 31, 1993

May 19, 1994

Jun 01, 1994

Jun 04, 1994

Jun 22, 1994

Aug 01, 1994

Dec 31, 1994

Dec 31, 1994

Dec 31, 1994

Jul 28, 1995

Aug 15, 1995

Aug 31, 1995

Nov 01, 1995

Dec 31, 1995

Dec 31, 1995

Dec 31, 1995

Dec 31, 1996

Oct 01, 1998

Apr 02, 1999

Jun 29, 1999

Nov 15, 1999

Dec 21, 1999