1881 0.200000E-01 1882 0.300000E-01 1883 0.300000E-01 1884 0.200000E-01 1885 0.200000E-01 1886 0.200000E-01 1887 0.300000E-01 1888 0.400000E-01 1889 0.400000E-01 1890 0.500000E-01 1891 0.500000E-01 1892 0.600000E-01 1893 0.700000E-01 1894 0.900000E-01 1895 0.120000 1896 0.160000 1897 0.220000 1898 0.340000 1899 0.600000 1900 0.770000 1901 0.780000 1902 1.32000 1903 0.950000 1904 1.08000 1905 1.54000 1906 2.09000 1907 2.44000 1908 1.50000 1909 0.920000 1910 1.52000 1911 1.39000 1912 1.92000 1913 1.99000 1914 1.48000 1915 1.07000 1916 1.31000 1917 2.73000 1918 1.05000 1919 0.530000 1920 1.59000 1921 2.00000 1922 3.27000 1923 4.13000 1924 5.10000 1925 5.70000 1926 5.76000 1927 5.88000 1928 5.29000 1929 7.33000 1930 6.65000 1931 2.99000 1932 1.58000 1933 -0.680000 1934 -0.200000 1935 0.400000 1936 0.900000 1937 2.73000 1938 2.02000 1939 2.30000 1940 4.10000 1941 6.30000 1942 2.75000 1943 -0.300000 1944 1.00000 1945 1.70000 1946 5.90000 1947 8.90000 1948 12.1000 1949 9.70000 1950 9.40000 1951 8.40000 1952 10.9000 1953 12.2000 1954 13.8000 1955 16.6000 1956 20.5000