Apr 1970 Aug 1970 Dec 1970 Apr 1971 Aug 1971 Dec 1971

Apr 1972 Aug 1972 Dec 1972 Apr 1973 Aug 1973 Dec 1973

Apr 1974 Aug 1974 Dec 1974 Apr 1975 Aug 1975 Dec 1975

Apr 1976 Aug 1976 Dec 1976 Apr 1977 Aug 1977 Dec 1977

Apr 1978 Aug 1978 Dec 1978 Apr 1979 Aug 1979 Dec 1979

Apr 1980 Aug 1980 Dec 1980 Apr 1981 Aug 1981 Dec 1981

May 1982 Aug 1982 Dec 1982 Apr 1983 Aug 1983 Dec 1983

Apr 1984 Aug 1984 Dec 1984 Apr 1985 Aug 1985 Dec 1985

50th Jubilee Pohokura 1985

Apr 1986 Aug 1986 Dec 1986 Apr 1987 Aug 1987 Dec 1987

Apr 1988 Aug 1988 Dec 1988 Apr 1989 Aug 1989 Dec 1989

Apr 1990 Aug 1990 Dec 1990 Apr 1991 Aug 1991 Dec 1991

Apr 1992 Aug 1992 Dec 1992 Apr 1993 Aug 1993 Dec 1993

Apr 1994 Aug 1994 Dec 1994 Apr 1995 Aug 1995 Dec 1995

Apr 1996 Aug 1996 Dec 1996 May 1997 Sep 1997 Dec 1997

Apr 1998 Aug 1998 Jan 1999 Apr 1999 Aug 1999 Dec 1999