"Year" "Count" "ObserverNumber" 1966 34 1 1967 40 1 1968 42 1 1969 54 1 1970 49 1 1971 71 1 1972 66 1 1973 56 1 1974 72 1 1976 77 1 1977 37 1 1978 32 1 1979 26 1 1980 22 1 1981 31 1 1982 28 1 1983 41 1 1984 36 1 1985 37 1 1986 44 1 1987 34 1 1988 47 1 1989 45 1 1990 41 1 1991 32 1 1992 40 1 1993 120 2 1994 96 2 1995 93 2 1996 67 2 1997 84 2 1998 90 2 1999 37 3 2000 34 3 2001 34 3 2003 43 3