# year    value 
 1900 -0.3410596 
 1901 -0.4180633 
 1902 -0.4655908 
 1903 -0.6666887 
 1904 -0.5281584 
 1905 -0.588522 
 1906 -0.4184205 
 1907 -0.4491722 
 1908 -0.3790515 
 1909 -0.4152802 
 1910 -0.3910338 
 1911 -0.2550423 
 1912 -0.3014038 
 1913 -0.444236 
 1914 -0.3842548 
 1915 -0.2737426 
 1916 -0.2609614 
 1917 -0.3752014 
 1918 -0.3076051 
 1919 -0.2588151 
 1920 -0.1937905 
 1921 -0.2199566 
 1922 -0.1777502 
 1923 -0.2351004 
 1924 -0.1892672 
 1925 -0.3168152 
 1926 -0.280282 
 1927 -0.2094759 
 1928 -0.1809294 
 1929 -0.2455137 
 1930 -0.2589899 
 1931 -0.1883556 
 1932 -0.2348518 
 1933 -0.2809506 
 1934 -0.2465936 
 1935 -0.1308037 
 1936 -0.107078 
 1937 -0.1673767 
 1938 -0.1063106 
 1939 -0.1770367 
 1940 -0.1785572 
 1941 -0.0527601 
 1942 -0.1053445 
 1943 -0.05739367 
 1944 -0.08279778 
 1945 -0.1341865 
 1946 -0.07266907 
 1947 -0.1161637 
 1948 -0.06188958 
 1949 -0.03684429 
 1950 -0.1078994 
 1951 -0.06284308 
 1952 -0.2016062 
 1953 -0.0803588 
 1954 -0.07499574 
 1955 -0.05748662 
 1956 0.04266755 
 1957 -0.1160732 
 1958 -0.01825826 
 1959 0.04688411 
 1960 -0.06157883 
 1961 -0.04732269 
 1962 -0.03948428 
 1963 -0.330365 
 1964 -0.4415054 
 1965 -0.3030305 
 1966 -0.2550246 
 1967 -0.2195705 
 1968 -0.2271936 
 1969 -0.245369 
 1970 -0.1091552 
 1971 -0.04230292 
 1972 -0.0892355 
 1973 -0.03220769 
 1974 -0.05151735 
 1975 -0.04125078 
 1976 0.02450645 
 1977 -0.04278536 
 1978 0.07110208 
 1979 0.2033075 
 1980 0.2761537 
 1981 0.2094774 
 1982 0.03427638 
 1983 -0.02857441 
 1984 0.1179296 
 1985 0.07221705 
 1986 0.08081185 
 1987 0.2517667 
 1988 0.2591243 
 1989 0.3971866 
 1990 0.3828522 
 1991 0.06460824 
 1992 0.01988627 
 1993 0.1315419 
 1994 0.2082799 
 1995 0.3120418 
 1996 0.3907456 
 1997 0.4805041 
 1998 0.5257257 
 1999 0.5396441 
 2000 0.6006845 
 2001 0.7342395 
 2002 0.6930557 
 2003 0.6530336 
 2004 0.6955422 
 2005 0.8015531