Preserved : 1972 (none, 1 to 15); 1973 (none, 1 to 15); 1974 (none, 1 to 15); 1975 (none, 1 to 15); 1976 (none, 1 to 15); 1977 (none, 1 to 15); 1978 (none, 1 to 12); 1979 (1 to 12); 1980 (none, 1 to 12); 1981 (none, 1 to 12); 1982 (none, 1 to 12); 1983 (none, 1 to 12); 1984 (none, 1 to 12); 1985 (none, 1 to 12); 1986 (none, 1 to 12); 1987 (1 to 12); 1988 (none, 1 to 12); 1989 (none, 1 to 12); 1990 (none, 1 to 12); 1991 (none, 1 to 12); 1992 (none, 1 to 12); 1993 (none, 1 to 12); 1994 (1 to 12); 1995 (1 to 12); 1996 (none, 1 to 12); 1997 (1 to 12); 1998 (1 to 12); 1999 (1 to 12); 2000 (1 to 12); 2001 (1 to 12); 2002 (1 to 12) |