1870.5   -74.4    22.2
  1871.5   -77.4    22.2
  1872.5   -69.0    22.1
  1873.5   -72.7    22.1
  1874.5   -74.4    22.2
  1875.5   -78.0    22.1
  1876.5   -65.5    22.1
  1877.5   -55.4    22.1
  1878.5   -54.0    22.2
  1879.5   -66.0    21.7
  1880.5   -65.2    21.5
  1881.5   -61.5    21.4
  1882.5   -74.0    19.5
  1883.5   -72.7    19.5
  1884.5   -61.8    19.1
  1885.5   -64.2    18.8
  1886.5   -58.5    18.2
  1887.5   -61.8    18.2
  1888.5   -65.0    18.1
  1889.5   -59.2    18.1
  1890.5   -59.5    18.1
  1891.5   -58.9    18.2
  1892.5   -55.3    19.0
  1893.5   -49.9    18.7
  1894.5   -57.3    19.1
  1895.5   -45.5    19.1
  1896.5   -51.1    18.3
  1897.5   -47.3    17.2
  1898.5   -42.8    16.7
  1899.5   -38.3    16.9
  1900.5   -46.8    15.2
  1901.5   -50.5    15.0
  1902.5   -48.3    15.0
  1903.5   -41.1    14.8
  1904.5   -43.8    14.8
  1905.5   -47.8    13.7
  1906.5   -41.6    13.0
  1907.5   -44.0    13.1
  1908.5   -46.6    12.6
  1909.5   -42.4    12.4
  1910.5   -44.7    12.6
  1911.5   -36.5    12.1
  1912.5   -39.7    12.0
  1913.5   -38.5    11.8
  1914.5   -30.3    11.7
  1915.5   -23.9    11.6
  1916.5   -32.6    10.9
  1917.5   -36.9    10.9
  1918.5   -33.9    10.7
  1919.5   -31.9    10.7
  1920.5   -32.4    10.9
  1921.5   -34.0    11.7
  1922.5   -35.2    11.8
  1923.5   -32.1    11.6
  1924.5   -39.6    11.5
  1925.5   -41.0    10.8
  1926.5   -35.5    11.0
  1927.5   -33.1    10.9
  1928.5   -33.9    10.8
  1929.5   -36.8    10.6
  1930.5   -29.2    10.5
  1931.5   -29.2    10.7
  1932.5   -24.3    10.7
  1933.5   -22.5    10.5
  1934.5   -28.7    10.5
  1935.5   -20.3    10.6
  1936.5   -20.6    10.5
  1937.5   -17.3     9.9
  1938.5   -12.2    10.0
  1939.5   -11.8    10.1
  1940.5   -16.5     9.6
  1941.5    -1.5     9.4
  1942.5    -0.4     9.4
  1943.5    -2.8     9.5
  1944.5    -4.7     9.2
  1945.5    -2.1     9.2
  1946.5     3.7     9.3
  1947.5     4.0     8.8
  1948.5    10.0     8.6
  1949.5     9.6     7.8
  1950.5    14.5     7.6
  1951.5    25.1     7.3
  1952.5    22.1     7.2
  1953.5    24.6     7.0
  1954.5    23.0     6.9
  1955.5    26.1     6.7
  1956.5    20.9     6.7
  1957.5    35.5     6.6
  1958.5    38.6     6.2
  1959.5    37.3     6.2
  1960.5    38.7     6.2
  1961.5    43.0     6.0
  1962.5    39.3     6.0
  1963.5    39.6     6.1
  1964.5    33.9     6.1
  1965.5    45.2     6.1
  1966.5    38.7     5.9
  1967.5    38.1     5.9
  1968.5    39.3     6.0
  1969.5    48.6     6.2
  1970.5    46.4     6.1
  1971.5    54.4     6.0
  1972.5    58.9     6.1
  1973.5    58.5     6.0
  1974.5    66.7     5.9
  1975.5    65.5     5.9
  1976.5    62.9     5.8
  1977.5    58.6     5.7
  1978.5    63.9     5.8
  1979.5    63.3     5.8
  1980.5    68.5     5.7
  1981.5    79.2     5.8
  1982.5    72.8     5.8
  1983.5    78.3     5.7
  1984.5    77.6     5.6
  1985.5    68.0     5.5
  1986.5    67.1     5.5
  1987.5    72.7     5.6
  1988.5    74.0     5.6
  1989.5    74.9     5.6
  1990.5    81.2     5.6
  1991.5    91.2     5.7
  1992.5    93.7     5.7
  1993.5    88.4     5.6
  1994.5    91.6     5.6
  1995.5    98.3     5.6
  1996.5   102.4     5.7
  1997.5   111.8     5.8
  1998.5   105.4     5.9
  1999.5   110.1     6.2
  2000.5   113.7     6.6
  2001.5   116.0     8.9