Dec 31, 1997

Nov 11, 1997

Dec 31, 1995

Dec 31, 1994

Jan 07, 1994

Dec 31, 1993

Dec 31, 1992

Dec 31, 1992

Nov 01, 1992

Jun 03, 1990

Jan 01, 1990

Dec 31, 1989

Dec 31, 1989