Year GMSL SD
1930.5 -31.3 10.72
1931.5 -25.79 11.09
1932.5 -33.85 11.61
1933.5 -28.84 11.61
1934.5 -26.58 11.43
1935.5 -24.36 11.35
1936.5 -29.58 11.42
1937.5 -23.09 11.51
1938.5 -13.82 11.32
1939.5 -12.69 11.33
1940.5 -11.85 10.66
1941.5 -0.91 10.42
1942.5 -3.61 10.56
1943.5 -0.04 10.68
1944.5 -5.85 9.94
1945.5 2.83 9.76
1946.5 3.1 9.7
1947.5 10.59 8.86
1948.5 15.84 8.52
1949.5 23.77 7.59
1950.5 25.16 7.16
1951.5 33.16 6.91
1952.5 29.81 6.71
1953.5 30.77 6.54
1954.5 31.22 6.25
1955.5 34.57 6.02
1956.5 28.45 6
1957.5 42.64 6.02
1958.5 42.15 5.59
1959.5 46.62 5.36
1960.5 52.13 5.42
1961.5 55.43 5.39
1962.5 54.99 5.4
1963.5 51.56 5.42
1964.5 44.43 5.72
1965.5 49.2 5.7
1966.5 40.58 5.6
1967.5 42.95 5.5
1968.5 46.74 5.68
1969.5 48.41 5.94
1970.5 50.61 5.92
1971.5 56.38 5.86
1972.5 61.96 5.91
1973.5 62.76 5.78
1974.5 71.66 5.75
1975.5 70.48 5.68
1976.5 66.88 5.71
1977.5 65.49 5.49
1978.5 72.35 5.45
1979.5 70.5 5.51
1980.5 75.57 5.44
1981.5 82.6 5.39
1982.5 78.15 5.09
1983.5 84.48 5.19
1984.5 86.44 5.08
1985.5 82.96 4.96
1986.5 81.45 4.88
1987.5 85.02 4.88
1988.5 89.46 5.09
1989.5 94.46 5.16
1990.5 94.69 5.08
1991.5 97.45 4.98
1992.5 97.1 5.01
1993.5 92.79 4.91
1994.5 96.11 4.88
1995.5 100.95 4.93
1996.5 104.89 4.88
1997.5 110.35 4.96
1998.5 105.44 4.97
1999.5 113.55 5.09
2000.5 114.15 5.11
2001.5 115.24 5.07
2002.5 115.28 5.17
2003.5 121.73 5.38
2004.5 123.41 6.11
2005.5 128.05 6.43
2006.5 141.67 6.87
2007.5 137.64 7.22