1895	53.007
1896	55.201
1897	53.953
1898	54.822
1899	52.886
1900	55.121
1901	54.574
1902	54.238
1903	53.271
1904	53.141
1905	53.347
1906	54.027
1907	53.846
1908	54.686
1909	54.399
1910	55.117
1911	55.317
1912	52.312
1913	53.979
1914	54.937
1915	53.56
1916	54.027
1917	52.482
1918	54.501
1919	54.807
1920	53.272
1921	56.511
1922	54.116
1923	53.887
1924	53.204
1925	56.007
1926	54.902
1927	54.82
1928	54.548
1929	53.402
1930	55.091
1931	55.755
1932	55.055
1933	55.147
1934	57.26
1935	55.076
1936	54.807
1937	54.067
1938	55.998
1939	55.49
1940	54.097
1941	55.099
1942	54.389
1943	55.082
1944	54.597
1945	54.731
1946	55.869
1947	54.226
1948	54.15
1949	54.438
1950	53.671
1951	54.099
1952	55.282
1953	55.906
1954	55.93
1955	54.567
1956	54.636
1957	54.818
1958	54.363
1959	54.943
1960	53.72
1961	55.048
1962	54.109
1963	54.553
1964	54.404
1965	53.715
1966	53.93
1967	54.567
1968	54.148
1969	54.133
1970	54.338
1971	54.03
1972	54.744
1973	54.698
1974	55.241
1975	53.818
1976	55.14
1977	55.206
1978	53.452
1979	52.533
1980	54.871
1981	56.097
1982	53.552
1983	55.075
1984	54.727
1985	54.61
1986	56.638
1987	56.271
1988	55.356
1989	54.861
1990	56.473
1991	56.223
1992	55.823
1993	53.993
1994	55.306
1995	55.527
1996	54.761
1997	54.747
1998	56.578
1999	56.24
2000	57.34