Year mean X-pole mean Y-pole (") (") ================================== 1900.0 -0.142 -0.041 1901.0 -0.140 -0.031 1902.0 -0.137 -0.023 1903.0 -0.135 -0.014 1904.0 -0.132 -0.007 1905.0 -0.129 0.000 1906.0 -0.126 0.007 1907.0 -0.123 0.012 1908.0 -0.120 0.018 1909.0 -0.117 0.022 1910.0 -0.114 0.027 1911.0 -0.110 0.030 1912.0 -0.106 0.034 1913.0 -0.102 0.037 1914.0 -0.099 0.040 1915.0 -0.095 0.042 1916.0 -0.091 0.045 1917.0 -0.087 0.047 1918.0 -0.084 0.050 1919.0 -0.081 0.052 1920.0 -0.078 0.055 1921.0 -0.076 0.057 1922.0 -0.074 0.060 1923.0 -0.073 0.062 1924.0 -0.073 0.065 1925.0 -0.072 0.068 1926.0 -0.073 0.071 1927.0 -0.073 0.073 1928.0 -0.073 0.076 1929.0 -0.074 0.079 1930.0 -0.074 0.081 1931.0 -0.075 0.083 1932.0 -0.075 0.085 1933.0 -0.074 0.087 1934.0 -0.073 0.089 1935.0 -0.072 0.090 1936.0 -0.070 0.090 1937.0 -0.067 0.091 1938.0 -0.065 0.091 1939.0 -0.061 0.090 1940.0 -0.058 0.090 1941.0 -0.054 0.089 1942.0 -0.050 0.088 1943.0 -0.046 0.087 1944.0 -0.042 0.086 1945.0 -0.038 0.086 1946.0 -0.034 0.086 1947.0 -0.031 0.086 1948.0 -0.028 0.087 1949.0 -0.026 0.089 1950.0 -0.024 0.091 1951.0 -0.022 0.094 1952.0 -0.021 0.098 1953.0 -0.020 0.102 1954.0 -0.019 0.108 1955.0 -0.018 0.114 1956.0 -0.018 0.120 1957.0 -0.018 0.127 1958.0 -0.017 0.134 1959.0 -0.017 0.142 1960.0 -0.016 0.149 1961.0 -0.016 0.157 1962.0 -0.015 0.164 1963.0 -0.014 0.172 1964.0 -0.012 0.179 1965.0 -0.010 0.186 1966.0 -0.008 0.193 1967.0 -0.006 0.200 1968.0 -0.003 0.207 1969.0 0.000 0.213 1970.0 0.003 0.220 1971.0 0.006 0.226 1972.0 0.009 0.232 1973.0 0.013 0.238 1974.0 0.016 0.243 1975.0 0.020 0.249 1976.0 0.023 0.254 1977.0 0.027 0.260 1978.0 0.030 0.265 1979.0 0.033 0.270 1980.0 0.036 0.275 1981.0 0.038 0.280 1982.0 0.041 0.285 1983.0 0.043 0.289 1984.0 0.045 0.294 1985.0 0.047 0.298 1986.0 0.048 0.302 1987.0 0.050 0.306 1988.0 0.051 0.310 1989.0 0.051 0.314 1990.0 0.052 0.318 1991.0 0.052 0.321 1992.0 0.053 0.325 1993.0 0.053 0.328 1994.0 0.053 0.331 1995.0 0.053 0.334 1996.0 0.054 0.337 1997.0 0.054 0.340 1998.0 0.054 0.343 1999.0 0.055 0.345 2000.0 0.055 0.348 2001.0 0.056 0.351 2002.0 0.057 0.353 2003.0 0.058 0.356 2004.0 0.059 0.359 2005.0 0.060 0.362 2006.0 0.061 0.364 2007.0 0.062 0.365