1895	72
1896	74.21
1897	73.97
1898	73.85
1899	73.42
1900	73.66
1901	76.94
1902	72.76
1903	72.49
1904	71.95
1905	72.45
1906	72.83
1907	73.15
1908	73.71
1909	73.29
1910	74.7
1911	73.28
1912	72.94
1913	73.77
1914	74.79
1915	71.69
1916	75.03
1917	75.27
1918	73.04
1919	74.96
1920	73.37
1921	75.28
1922	73.6
1923	74.43
1924	72.51
1925	74.78
1926	74.08
1927	73.38
1928	74.06
1929	74.35
1930	75.73
1931	76.43
1932	74.9
1933	75.91
1934	77.15
1935	75.92
1936	77.58
1937	75.34
1938	74.53
1939	75.58
1940	74.88
1941	74.81
1942	74.75
1943	75.06
1944	73.54
1945	73.71
1946	74.6
1947	73.6
1948	74.03
1949	74.94
1950	71.96
1951	74.35
1952	74.8
1953	74.83
1954	76.2
1955	75.17
1956	73.82
1957	75.05
1958	73.32
1959	74.29
1960	74.58
1961	73.94
1962	72.81
1963	74.39
1964	75.4
1965	73.39
1966	75.83
1967	73.28
1968	73.66
1969	74.86
1970	74.74
1971	73.21
1972	72.97
1973	74.08
1974	74.92
1975	74.35
1976	73.73
1977	75.26
1978	74.64
1979	73.97
1980	76.55
1981	74.73
1982	74.02
1983	74.86
1984	73.99
1985	74.88
1986	74.4
1987	74.11
1988	75.58
1989	74.98
1990	74.12
1991	74.76
1992	72.09
1993	73.1
1994	74.37
1995	74.43
1996	74.36
1997	74.02
1998	76.24
1999	75.18
2000	74.78