# year    value 
 1900 -0.4122445 
 1901 -0.4505761 
 1902 -0.487323 
 1903 -0.8519134 
 1904 -0.7158529 
 1905 -0.6347494 
 1906 -0.4682329 
 1907 -0.5344129 
 1908 -0.5302063 
 1909 -0.4943998 
 1910 -0.4601742 
 1911 -0.4540528 
 1912 -0.6953156 
 1913 -0.629063 
 1914 -0.5524155 
 1915 -0.4329903 
 1916 -0.4569909 
 1917 -0.3999465 
 1918 -0.329068 
 1919 -0.3222463 
 1920 -0.3711386 
 1921 -0.3587615 
 1922 -0.3221014 
 1923 -0.2709407 
 1924 -0.3180674 
 1925 -0.3288629 
 1926 -0.2804565 
 1927 -0.257692 
 1928 -0.3134562 
 1929 -0.3565275 
 1930 -0.2914757 
 1931 -0.3023974 
 1932 -0.3210289 
 1933 -0.3689217 
 1934 -0.3124169 
 1935 -0.2781216 
 1936 -0.3259731 
 1937 -0.2347309 
 1938 -0.2842066 
 1939 -0.2428421 
 1940 -0.2825601 
 1941 -0.1911241 
 1942 -0.2619841 
 1943 -0.2193203 
 1944 -0.2315241 
 1945 -0.2337363 
 1946 -0.275972 
 1947 -0.2677551 
 1948 -0.2094663 
 1949 -0.1848859 
 1950 -0.2115792 
 1951 -0.2368829 
 1952 -0.2746984 
 1953 -0.2245488 
 1954 -0.2491202 
 1955 -0.2155746 
 1956 -0.2099417 
 1957 -0.2069895 
 1958 -0.2990634 
 1959 -0.1788317 
 1960 -0.259907 
 1961 -0.2431374 
 1962 -0.22913 
 1963 -0.3821204 
 1964 -0.5249782 
 1965 -0.4593134 
 1966 -0.3929317 
 1967 -0.404149 
 1968 -0.421129 
 1969 -0.4074138 
 1970 -0.2992254 
 1971 -0.180822 
 1972 -0.2655548 
 1973 -0.2398798 
 1974 -0.2061422 
 1975 -0.1969568 
 1976 -0.2192295 
 1977 -0.1977231 
 1978 -0.08782739 
 1979 0.009690185 
 1980 -0.005177625 
 1981 0.02477146 
 1982 -0.1794701 
 1983 -0.2794791 
 1984 -0.144165 
 1985 -0.05892948 
 1986 -0.02123003 
 1987 0.08830583 
 1988 0.1934104 
 1989 0.2012999 
 1990 0.2424345 
 1991 0.04085604 
 1992 -0.2028894 
 1993 -0.01124241 
 1994 0.1371314 
 1995 0.2171964 
 1996 0.2928767 
 1997 0.3638205 
 1998 0.4735756 
 1999 0.4574862 
 2000 0.568127 
 2001 0.6348191 
 2002 0.6480066 
 2003 0.6450397 
 2004 0.6415975 
 2005 0.7090813