1968 Dec 26-1969 Sept 11

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1969 Oct 22-1971 Dec 10

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1972 May 22-1973 Aug 6

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1973 Oct 1-1974 Dec 1

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1975 Feb 3-1975 Apr 7

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1975 May 5-1976 Feb 2

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1976 Feb 12-1976 Dec 6

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1977 Apr 4-1978 Mar 7

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1978 Apr 3-1978 Nov 6

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1978 Dec 6-1979 Aug 6

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1979 Sept 17-1980 Sept 2

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1980 Oct 16-1981 Jul 6

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1981 Aug 3-1982 Sept 14

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1982 Sept 27-1983 Nov 7

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1983 Nov 7-1984 May 7

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1984 Jun 4-1986 Feb 18

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1985 Apr 15-1986 Dec 8

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1987 Mar 9

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1989 Mar 6-1990 Nov 19 

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1991 Jan 21-1993 Jul 2

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1993 Aug 8-1995 Aug 15

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1996 April 4-(2002)