Date Span
Jan 1980-May 1980
2
[1962]
2
1 Oct 1989-21 Feb 1990
1
11 Apr 1972-25 Apr 1972
1
14 Jun 1984
1
1968-1970
1
1977-1979
1
1979-1988
1
1982-1986
1
21 May 1977-22 May 1977
1
26 Mar 1984-8 Jun 1984
1
26 Oct 1971
1
30 Aug-1 Nov 1990
1
5 Nov-28 Nov 1991
1
5 Sep-30 Sep 1991
1
9 Dec 1991-16 Mar 1992
1
9 Jan 1991
1
Apr 1984-Nov 1989
1
Feb 1977-Apr 1979
1
Feb 1977-Nov 1980
1
Feb 1988-Dec 1991
1
Feb 1988-Mar 1990
1
Jan 1971
1
Jan 1971-Oct 1974
1
Jan 1979-Dec 1979
1
Jan 1984-Sep 1990
1
Jul 1987-Feb 1991
1
Jun 1976-1979
1
Jun 1976-Dec 1976
1
Jun 1979-Dec 1979
1
Jun 1983-Jun 1984
1
Mar 1982-Feb 1984
1
Mar-Sep 1991
1
May 1988-Jan 1991
1
Nov 1988-Nov 1990
1
Oct 1983-Apr 1991
1
Sep 1974-Nov 1979
1
Sep-Dec 1991
1
[1987]
1
[1991]
1
[Apr 1980-Dec 1990]
1
[Aug 1973-Jan 1979]
1
[Jan 1979-Apr 1979]
1