Jun 19, 1981

Nov 01, 1981

May 01, 1982

Feb 01, 1983

Dec 31, 1986

Oct 01, 1987

Dec 31, 1989

Apr 26, 1990

Jul 27, 1990

Jan 08, 1991

Jan 14, 1991

Jan 25, 1991

Jul 28, 1992