Dec 31, 1981

Dec 31, 1982

Aug 21, 1986

Dec 31, 1986

Mar 15, 1987

Jul 01, 1987

Oct 01, 1987

Dec 31, 1987

Dec 31, 1988

Apr 01, 1989

May 01, 1989

Jun 15, 1989

Dec 08, 1989

Dec 15, 1989

Dec 31, 1989

Jun 05, 1990

Jul 01, 1990

Nov 19, 1990

Dec 22, 1990

Dec 26, 1990

Dec 31, 1990

Dec 31, 1990

Mar 12, 1991

Aug 02, 1991

Aug 29, 1991

Sep 05, 1991

Oct 08, 1991

Oct 08, 1991

Nov 01, 1991

Dec 06, 1991

Dec 13, 1991

Dec 20, 1991

Dec 31, 1991

Feb 19, 1992

Feb 19, 1992

May 27, 1992