# year    value 
 1900 -0.5096025 
 1901 -0.570862 
 1902 -0.6545424 
 1903 -0.9795728 
 1904 -0.7018653 
 1905 -0.7342998 
 1906 -0.588195 
 1907 -0.5461178 
 1908 -0.6107551 
 1909 -0.5632734 
 1910 -0.545478 
 1911 -0.5343337 
 1912 -0.7557304 
 1913 -0.6812267 
 1914 -0.6274248 
 1915 -0.4784813 
 1916 -0.4603543 
 1917 -0.4877093 
 1918 -0.429652 
 1919 -0.3173167 
 1920 -0.3990911 
 1921 -0.4520302 
 1922 -0.4060414 
 1923 -0.3520808 
 1924 -0.3945957 
 1925 -0.4487925 
 1926 -0.3173288 
 1927 -0.3716046 
 1928 -0.4229374 
 1929 -0.5188502 
 1930 -0.3655265 
 1931 -0.4629458 
 1932 -0.475595 
 1933 -0.416283 
 1934 -0.4057972 
 1935 -0.37568 
 1936 -0.3821107 
 1937 -0.3470371 
 1938 -0.399175 
 1939 -0.2714153 
 1940 -0.3927793 
 1941 -0.3774325 
 1942 -0.355774 
 1943 -0.356125 
 1944 -0.3332676 
 1945 -0.3816536 
 1946 -0.3436072 
 1947 -0.316094 
 1948 -0.317091 
 1949 -0.2895955 
 1950 -0.2858486 
 1951 -0.3638105 
 1952 -0.3895572 
 1953 -0.4423538 
 1954 -0.4126099 
 1955 -0.3646187 
 1956 -0.2719943 
 1957 -0.3256143 
 1958 -0.4255061 
 1959 -0.3057951 
 1960 -0.3894553 
 1961 -0.4226096 
 1962 -0.4555285 
 1963 -0.5557367 
 1964 -0.7480465 
 1965 -0.5637431 
 1966 -0.5235303 
 1967 -0.6301501 
 1968 -0.6338164 
 1969 -0.5559862 
 1970 -0.4643864 
 1971 -0.3220193 
 1972 -0.4389089 
 1973 -0.3825461 
 1974 -0.3138775 
 1975 -0.3594845 
 1976 -0.4762115 
 1977 -0.3035628 
 1978 -0.3296406 
 1979 -0.1562755 
 1980 -0.2336677 
 1981 -0.1681514 
 1982 -0.4332133 
 1983 -0.4439685 
 1984 -0.3455444 
 1985 -0.2577359 
 1986 -0.1529285 
 1987 -0.06147056 
 1988 -0.07039399 
 1989 0.06033607 
 1990 -0.01884447 
 1991 -0.2263768 
 1992 -0.4085029 
 1993 -0.1921785 
 1994 -0.03672426 
 1995 -0.02673386 
 1996 0.1743105 
 1997 0.1138912 
 1998 0.2275646 
 1999 0.240922 
 2000 0.3010274 
 2001  0.44106 
 2002 0.3458602 
 2003 0.3991689 
 2004 0.4014174 
 2005 0.4929191