g0ÕDBWINUS0WATERYEARN WOODACREN SANGERONIMON  1951 40.37 1952 62.08 1953 51.02 1954 42.74 1955 31.89 1956 75.94 1957 36.76 1958 69.16 1959 30.29 1960 30.11 1961 31.00 1962 39.46 1963 50.24 1964 28.37 25.78 1965 46.75 28.26 1966 36.67 1967 62.35 1968 33.75 1969 64.03 52.05 1970 56.76 48.30 1971 42.26 42.88 1972 25.13 26.65 1973 61.08 64.36 1974 60.41 63.54 1975 40.82 43.28 1976 18.59 18.56 1977 17.01 17.81 1978 58.34 55.90 1979 33.33 31.09 1980 47.09 34.92 1981 26.25 26.70 1982 68.51 60.09 1983 79.12 78.37 1984 36.52 39.21 1985 34.55 35.50 1986 49.56 59.02 1987 20.11 24.78 1988 25.34 29.32 1989 34.88 1990 26.06 1991 30.45 1992 33.38 1993 56.62 1994 27.15 1995 77.02 1996 1997 48.90 1998 30.66