# year    value 
 1900 -0.176906 
 1901 -0.1840153 
 1902 -0.2476384 
 1903 -0.5403943 
 1904 -0.4594923 
 1905 -0.3497254 
 1906 -0.24144 
 1907 -0.3066822 
 1908 -0.2788363 
 1909 -0.2496692 
 1910 -0.2095425 
 1911 -0.2267052 
 1912 -0.3775807 
 1913 -0.3728151 
 1914 -0.2777455 
 1915 -0.1987738 
 1916 -0.1974364 
 1917 -0.1497003 
 1918 -0.07573789 
 1919 -0.07677481 
 1920 -0.105863 
 1921 -0.1143762 
 1922 -0.05563731 
 1923 -0.0523021 
 1924 -0.08878887 
 1925 -0.06986795 
 1926 -0.04206828 
 1927 -0.002841468 
 1928 -0.02464676 
 1929 -0.07358941 
 1930 -0.05508651 
 1931 -0.04417129 
 1932 -0.05447976 
 1933 -0.1267066 
 1934 -0.08948203 
 1935 -0.01946012 
 1936 -0.03849327 
 1937 0.02889037 
 1938 0.01017015 
 1939 -0.006392623 
 1940 -0.03622413 
 1941 0.03960232 
 1942 -0.01266183 
 1943 0.02715957 
 1944 0.03300253 
 1945 0.02151628 
 1946 -0.01679428 
 1947 0.02681344 
 1948 0.03936204 
 1949 0.04770621 
 1950 0.03710325 
 1951 0.03500551 
 1952 0.004784728 
 1953 0.03989196 
 1954 0.0376767 
 1955 0.01626158 
 1956 0.04480363 
 1957 0.02944782 
 1958 0.02770784 
 1959 0.08499152 
 1960 0.03184002 
 1961 0.0279793 
 1962 0.0265433 
 1963 -0.1168539 
 1964 -0.2505361 
 1965 -0.1961179 
 1966 -0.1065037 
 1967 -0.08668437 
 1968 -0.1239186 
 1969 -0.1226163 
 1970 -0.03737226 
 1971 0.06252225 
 1972 0.04098113 
 1973 0.06421436 
 1974 0.0309454 
 1975 0.06854659 
 1976 0.0604207 
 1977 0.08083279 
 1978 0.1878499 
 1979 0.2620825 
 1980 0.2769887 
 1981 0.3103491 
 1982 0.09260758 
 1983 0.02037341 
 1984 0.1576817 
 1985 0.242935 
 1986 0.2239311 
 1987 0.3384297 
 1988 0.4180347 
 1989 0.4706783 
 1990 0.5274129 
 1991 0.3145562 
 1992 0.1012026 
 1993 0.2544644 
 1994 0.3719516 
 1995 0.4794319 
 1996 0.5524085 
 1997 0.6391878 
 1998 0.6814049 
 1999 0.7324247 
 2000 0.805007 
 2001 0.8700659 
 2002 0.9174109 
 2003 0.8986483 
 2004 0.9050453 
 2005 0.9681813