# year    value 
 1900 -0.1213462 
 1901 -0.1210844 
 1902 -0.1910525 
 1903 -0.4668495 
 1904 -0.3989695 
 1905 -0.2824354 
 1906 -0.1878977 
 1907 -0.2529185 
 1908 -0.2194916 
 1909 -0.191892 
 1910 -0.1503721 
 1911 -0.1730319 
 1912 -0.3025683 
 1913 -0.3123187 
 1914 -0.2129001 
 1915 -0.1434789 
 1916 -0.1361595 
 1917 -0.09062097 
 1918 -0.01593049 
 1919 -0.01882278 
 1920 -0.04323548 
 1921 -0.05668047 
 1922 0.007270793 
 1923 -0.0006847878 
 1924 -0.03465966 
 1925 -0.008723254 
 1926 0.01421164 
 1927 0.05732488 
 1928 0.04353671 
 1929 -0.006792039 
 1930 0.000721405 
 1931 0.01679196 
 1932 0.008448456 
 1933 -0.06952332 
 1934 -0.03685038 
 1935 0.0416059 
 1936 0.02937629 
 1937 0.09112736 
 1938 0.07966799 
 1939 0.04942949 
 1940 0.02193196 
 1941 0.09407333 
 1942 0.04619941 
 1943 0.08534976 
 1944 0.0954532 
 1945 0.08177755 
 1946 0.0443936 
 1947 0.09635654 
 1948 0.09810666 
 1949 0.1026177 
 1950 0.09581343 
 1951 0.09919428 
 1952 0.07076654 
 1953 0.1023223 
 1954 0.1053851 
 1955 0.07099464 
 1956 0.1049452 
 1957 0.08526706 
 1958 0.1048535 
 1959 0.1472761 
 1960 0.100717 
 1961 0.09198591 
 1962 0.08690381 
 1963 -0.05422848 
 1964 -0.1857445 
 1965 -0.1339814 
 1966 -0.0388824 
 1967 -0.01173578 
 1968 -0.05375184 
 1969 -0.05537995 
 1970 0.02444724 
 1971 0.1199721 
 1972 0.1133495 
 1973 0.1360064 
 1974 0.08691815 
 1975 0.131228 
 1976 0.1264419 
 1977 0.1465956 
 1978 0.2529332 
 1979 0.3216685 
 1980 0.3436038 
 1981 0.3777696 
 1982 0.156841 
 1983 0.09116403 
 1984 0.228943 
 1985 0.3142007 
 1986  0.28181 
 1987 0.3974802 
 1988 0.4710651 
 1989 0.5342746 
 1990 0.594692 
 1991 0.3791727 
 1992 0.172994 
 1993 0.3171939 
 1994 0.427389 
 1995 0.5413417 
 1996  0.61368 
 1997 0.7041978 
 1998 0.7304703 
 1999 0.7973335 
 2000 0.8609307 
 2001 0.925604 
 2002 0.9810133 
 2003 0.9585214 
 2004 0.9672413 
 2005 1.029351