Aug 01, 1981

Dec 31, 1981

Dec 31, 1982

Dec 31, 1982

Dec 31, 1982

Dec 31, 1982

Dec 31, 1982

Dec 31, 1982

Jun 01, 1983

Aug 01, 1983

Dec 31, 1983

Dec 31, 1983

Dec 31, 1983

Dec 31, 1983

Dec 31, 1983

Dec 31, 1983

Dec 31, 1983

Dec 31, 1983

Dec 31, 1983

Dec 31, 1984

Dec 31, 1984

Dec 31, 1984

Dec 31, 1984

Sep 30, 1997

Feb 01, 1998

Mar 19, 1998

Aug 01, 1998

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Dec 31, 1998

Dec 31, 1998

Aug 23, 2000

Sep 17, 2000

Dec 18, 2001

May 28, 2002

Oct 30, 2002

Dec 06, 2002