Date Span
12 Apr-10 Oct 1981
1
Aug 1983-Jun 1989
1
Dec 1986-Jul 1987
1
Feb 1988-Oct 1989
1
Jan 1989-Mar 1992
1
Jul 1985-Jul 1986
1
Mar 1981-Jan 1991
1
Mar-May 1990
1
May 1981-Apr 1990
1
Nov 1981-Aug 1984
1
Oct 1980-May 1984
1
Sep 1981-Jan 1985
1
Sep 1983-Jun 1989
1
[1981-1988]
1
[1983-1989]
1
[1985-1987]
1
[1988]
1
[1989]
1
[1990]
1
[Apr-Aug 1989]
1