1900	45.022
1901	43.77
1902	44.602
1903	43.843
1904	43.219
1905	43.087
1906	44.343
1907	44.263
1908	45.402
1909	44.233
1910	45.53
1911	45.596
1912	42.01
1913	43.561
1914	44.761
1915	44.36
1916	43.947
1917	41.585
1918	44.02
1919	44.612
1920	43.039
1921	47.013
1922	43.606
1923	43.579
1924	42.831
1925	46.501
1926	44.966
1927	45.853
1928	45.05
1929	42.969
1930	44.899
1931	45.55
1932	45.006
1933	44.679
1934	47.153
1935	44.897
1936	43.362
1937	43.201
1938	46.286
1939	45.474
1940	43.422
1941	45.277
1942	44.424
1943	44.712
1944	44.839
1945	45.489
1946	46.622
1947	44.15
1948	43.882
1949	44.282
1950	44.127
1951	44.329
1952	45.056
1953	46.307
1954	46.101
1955	44.438
1956	44.367
1957	44.927
1958	44.335
1959	44.603
1960	43.163
1961	45.005
1962	44.225
1963	44.39
1964	44.492
1965	43.902
1966	43.58
1967	44.896
1968	44.249
1969	43.837
1970	43.681
1971	43.692
1972	45.092
1973	44.717
1974	45.757
1975	43.814
1976	45.891
1977	44.994
1978	42.739
1979	41.943
1980	44.476
1981	46.457
1982	43.508
1983	44.981
1984	44.734
1985	44.822
1986	47.375
1987	46.825
1988	44.789
1989	45.201
1990	47.254
1991	46.862
1992	47.372
1993	44.249
1994	45.149
1995	45.804
1996	44.487
1997	45.028
1998	47.171
1999	46.884
2000	48.464