1867 1.33
1868 0.94
1869 0.79
1870 0.83
1871 0.61
1872 0.77
1873 0.93
1874 0.97
1875 1.20
1876 1.33
1877 1.36
1878 1.55
1879 0.95
1880 0.59
1881 0.61
1882 0.83
1883 1.06
1884 1.21
1885 1.16
1886 1.01
1887 0.97
1888 1.02
1889 1.04
1890 0.98
1891 1.07
1892 0.88
1893 1.28
1894 1.25
1895 1.09
1896 1.31
1897 1.26
1898 1.10
1899 0.81
1900 0.92
1901 0.90
1902 0.93
1903 0.94
1904 0.92
1905 0.85
1906 0.77
1907 0.83
1908 1.08
1909 0.87
1910 0.84
1911 0.88
1912 0.99
1913 0.99
1914 1.10
1915 1.32
1916 1.00
1917 0.80
1918 0.58
1919 0.38
1920 0.49
1921 1.02
1922 1.19
1923 0.94
1924 1.01
1925 1.00
1926 1.01
1927 1.07
1928 1.08
1929 1.04
1930 1.21
1931 1.33
1932 1.53