Monthly statistics /

1970; 1971 F-D; 1972-1975; 1976 JA-O; 1976; 1976-1977; 1977-1978; 1979 JA-N; 1979; 1980 (W/O AP,JY,AG); 1980; 1981 (W/O JY); 1981; 1982 (BD W/O S); 1982-1983; 1984 (W/O JE); 1984-1986; 1987 (W/O AG,S); 1987-1989; 1989 Jan-Jun; 1989 Jul-Dec; 1990 (W/O AP); 1990; 1990 Jan-Jun; 1990 Jul-Dec; 1991; 1991 Jan-Jun; 1991 Jul-Dec; 1992 JA-JE; 1992 JY-D; 1992 Jan-Jun; 1992 Jul-Dec; 1993 JA-JE; 1993 JY-D; 1993 Jan-Apr; 1993 May-Aug; 1993 Sep-Dec; 1994 (W/O MR,JE,N); 1994 JA-JE; 1994 JY-D; 1994 Jan-Jun; 1994 Jul-Dec; 1995 JY-D; 1995 JA-JE; 1995 Jan-Jun; 1995 Jul-Dec; 1996 JA-AP; 1996 MY-AG; 1996 S-D; 1996 Jan-Jun; 1996 Jul-Dec; 1997 JA-AP; 1997 MY-JE; 1997 Jan-Jun