# year    value 
 1900 -0.2370989 
 1901 -0.3388351 
 1902 -0.3079987 
 1903 -0.8826457 
 1904 -0.9181585 
 1905 -0.6064737 
 1906 -0.4729887 
 1907 -0.7503281 
 1908 -0.7153679 
 1909 -0.5672257 
 1910 -0.4883189 
 1911 -0.578871 
 1912 -1.011959 
 1913 -0.9683926 
 1914 -0.7020488 
 1915 -0.5819013 
 1916 -0.6251718 
 1917 -0.4184284 
 1918 -0.1018517 
 1919 -0.2035165 
 1920 -0.1603422 
 1921 -0.1286971 
 1922 -0.1843915 
 1923 -0.151317 
 1924 -0.2354376 
 1925 -0.2115341 
 1926 -0.2078781 
 1927 -0.05806789 
 1928 0.01479848 
 1929 0.03519837 
 1930 -0.2421939 
 1931 -0.04138031 
 1932 -0.2136244 
 1933 -0.2656816 
 1934 -0.2010949 
 1935 -0.2323897 
 1936 -0.2364058 
 1937 -0.1022473 
 1938 -0.01653336 
 1939 -0.1236805 
 1940 -0.0909709 
 1941 0.1176327 
 1942 -0.1348878 
 1943 -0.01164942 
 1944 -0.08547984 
 1945 0.1275992 
 1946 -0.1677387 
 1947 -0.04217941 
 1948 -0.07457662 
 1949 0.03804988 
 1950 0.08106584 
 1951 0.1235067 
 1952 0.000161012 
 1953 -0.008858467 
 1954 -0.006748209 
 1955 -0.07897507 
 1956 -0.09363509 
 1957 -0.03321208 
 1958 -0.06041096 
 1959 0.1600323 
 1960 0.002179131 
 1961 0.05429061 
 1962 0.1197776 
 1963 0.02283946 
 1964 -0.1574666 
 1965 -0.371397 
 1966 -0.191378 
 1967 -0.04957519 
 1968 -0.1975645 
 1969 0.04669914 
 1970 -0.0261155 
 1971 0.08659778 
 1972 0.01889649 
 1973 0.1868746 
 1974 0.04283239 
 1975 0.1353169 
 1976 0.0803008 
 1977 0.1951136 
 1978 0.4948069 
 1979 0.5077003 
 1980 0.4664382 
 1981 0.611995 
 1982 0.2991785 
 1983 0.002546292 
 1984 0.2086067 
 1985 0.4223238 
 1986 0.306191 
 1987 0.6483995 
 1988 0.7255879 
 1989 0.6867124 
 1990 1.097592 
 1991 0.9698042 
 1992 0.4254611 
 1993 0.5934966 
 1994 0.6748483 
 1995 0.9772835 
 1996 1.124792 
 1997 1.136342 
 1998 1.357428 
 1999 1.455599 
 2000 1.516609 
 2001 1.517267 
 2002 1.836394 
 2003  1.71393 
 2004 1.808329 
 2005 1.832844