Date Span
1 May 1981
1
10 Dec 1988
1
11 Nov 1982
1
12 May 1986
1
14 Mar 1985
1
14 May 1990
1
15 Apr 1991
1
15 May 1990
1
16 Nov 1981
1
18 Feb 1991
1
18 Jan 1991
1
19 Oct 1987
1
1989
1
20 Aug 1982
1
20 Dec 1988
1
20 Jul 1987 - 6 Aug 1987
1
22 Feb
1
22 Feb 1991
1
24 Sep 1989
1
25 May 1985
1
26 May 1981
1
30 Nov 1982
1
31 Jul 1987
1
6 Dec 1983
1
6 Sep 1990
1