dYEARN MONTHN H20CONTENTN  1955 5 9.5 1956 2 20.2 1956 3 30.6 1956 4 29.0 1956 5 11.6 1957 2 8.6 1957 4 14.0 1957 5 4.1 1958 3 21.4 1958 4 24.0 1958 5 19.8 1959 2 12.0 1959 3 21.7 1959 4 19.5 1959 5 0.0 1960 3 18.0 1960 4 15.4 1960 5 4.5 1961 2 8.2 1961 3 6.3 1961 4 17.4 1961 5 9.2 1962 2 10.0 1962 4 28.8 1962 5 13.0 1963 2 1.0 1963 3 0.0 1963 4 6.6 1963 5 8.4 1964 2 9.6 1964 3 9.0 1964 4 9.8 1964 5 0.7 1965 2 12.0 1965 3 10.7 1965 4 7.9 1965 5 4.3 1966 2 20.6 1966 3 22.2 1966 4 22.0 1966 5 5.0 1967 2 15.2 1967 3 13.9 1967 4 18.1 1967 5 23.3 1967 6 2.2 1968 2 18.2 1968 3 15.0 1968 4 12.5 1968 5 1.8 1969 2 28.0 1969 3 39.4 1969 4 38.8 1969 5 25.0 1970 2 13.0 1970 3 16.4 1970 4 13.9 1970 5 7.4 1971 2 16.6 1971 3 17.4 1971 4 21.0 1971 5 16.4 1972 2 15.0 1972 3 15.8 1972 4 4.8 1972 5 0.0 1973 2 18.0 1973 3 26.2 1973 4 30.8 1973 5 20.0 1974 3 18.6 1974 4 20.4 1974 5 22.0 1975 2 10.2 1975 3 23.6 1975 4 41.6 1975 5 39.2 1975 6 15.8 1976 2 5.8 1976 3 8.4 1976 4 12.2 1976 5 14.0 1977 2 4.0 1977 3 6.7 1977 4 10.4 1977 5 0.2 1978 1 6.6 1978 2 18.8 1978 3 24.1 1978 4 21.2 1978 5 20.9 1978 6 0.0 1979 2 6.6 1979 3 15.4 1979 4 16.5 1979 5 4.4 1980 2 7.3 1980 3 9.6 1980 4 8.8 1980 5 0.5 1981 2 9.2 1981 3 9.7 1981 4 11.2 1981 5 0.0 1982 2 7.4 1982 3 3.9 1982 4 13.6 1982 5 6.0 1983 2 30.0 1983 3 45.6 1983 4 51.2 1983 5 53.4 1983 6 32.8 1984 2 11.4 1984 3 13.2 1984 4 12.7 1984 5 3.8 1985 2 13.4 1985 3 15.3 1985 4 19.4 1985 5 1.8 1986 2 11.7 1986 3 18.8 1986 4 14.8 1986 5 1.8 1987 2 13.2 1987 3 15.6 1987 4 19.4 1987 5 0.0 1988 2 12.2 1988 3 10.0 1988 4 3.5 1988 5 0.0 1989 2 11.0 1989 3 12.2 1989 4 12.0 1989 5 0.0 1990 2 4.0 1990 3 9.8 1990 4 3.4 1990 5 0.0 1991 2 3.2 1991 3 4.4 1991 4 15.6 1991 5 4.2 1992 2 8.7 1992 3 18.6 1992 4 20.0 1992 5 0.0 1993 2 23.8 1993 3 28.6 1993 4 22.2 1993 5 13.8 1994 2 9.7 1994 3 17.0 1994 4 15.4 1994 5 0.8 1995 2 30.5 1995 3 21.8 1995 4 26.2 1995 5 18.1 1996 2 12.2 1996 3 13.3 1996 4 10.6 1996 5 0.8 1997 2 5.0 1997 3 4.6 1997 4 0.0 1997 5 0.0 1997 6 0.0 1998 1 0.0 1998 2 14.4 1998 3 38.4 1998 4 35.8 1998 5 26.8 1999 2 10.6 1999 3 24.6 1999 4 31.0 1999 5 24.2