Year GMSL (mm) std err(mm) 1900 -90.27 15.15 1901 -88.16 14.78 1902 -84.39 14.36 1903 -81.50 14.36 1904 -81.56 14.13 1905 -82.60 13.79 1906 -82.03 13.40 1907 -81.70 13.40 1908 -80.70 12.96 1909 -80.06 12.20 1910 -75.42 12.43 1911 -74.67 12.43 1912 -71.13 12.11 1913 -66.59 11.99 1914 -60.85 11.99 1915 -58.35 11.79 1916 -61.13 10.52 1917 -61.95 10.52 1918 -62.01 10.09 1919 -57.59 9.91 1920 -54.27 10.17 1921 -53.94 11.12 1922 -56.54 11.00 1923 -59.37 11.00 1924 -57.82 10.80 1925 -55.52 10.80 1926 -51.58 10.80 1927 -51.09 10.71 1928 -51.52 10.15 1929 -53.43 10.05 1930 -51.83 9.56 1931 -47.71 9.48 1932 -42.29 9.48 1933 -39.58 9.26 1934 -35.99 9.26 1935 -35.21 9.26 1936 -31.26 8.97 1937 -29.11 8.72 1938 -27.30 8.72 1939 -25.49 9.32 1940 -21.95 8.91 1941 -16.84 8.84 1942 -13.27 8.77 1943 -15.92 8.77 1944 -15.71 8.53 1945 -15.22 8.41 1946 -10.36 8.35 1947 -3.84 7.80 1948 1.42 7.06 1949 6.08 6.89 1950 6.45 6.59 1951 5.86 6.54 1952 9.83 6.54 1953 13.99 6.20 1954 18.37 6.20 1955 13.09 5.97 1956 11.39 5.97 1957 11.00 5.73 1958 16.02 5.55 1959 18.06 5.36 1960 20.36 5.12 1961 20.94 5.12 1962 19.21 5.16 1963 18.49 5.10 1964 19.17 5.10 1965 21.53 5.10 1966 20.42 5.06 1967 19.34 5.09 1968 21.51 5.16 1969 23.96 5.12 1970 28.69 5.21 1971 27.84 5.11 1972 29.45 5.13 1973 30.20 4.64 1974 30.07 4.48 1975 27.52 4.48 1976 26.07 4.46 1977 29.21 4.47 1978 33.88 4.44 1979 38.22 4.36 1980 42.18 4.54 1981 42.93 4.46 1982 47.38 4.37 1983 49.57 4.48 1984 48.96 4.37 1985 44.12 4.35 1986 42.15 4.35 1987 46.59 4.12 1988 49.71 4.25 1989 51.82 4.33 1990 53.33 4.36 1991 55.47 4.36 1992 55.89 4.26 1993 58.68 4.31 1994 61.25 4.46 1995 65.26 4.46 1996 70.57 4.52 1997 73.89 4.52 1998 78.27 4.56 1999 80.68 4.67 2000 84.83 4.60 2001 86.02 4.77 2002 90.59 4.93 2003 92.72 5.36 2004 96.90 5.69 2005 98.01 5.94 2006 99.77 5.95 2007 101.96 7.03