# year    value 
 1900 -0.3948747 
 1901 -0.5195844 
 1902 -0.4782117 
 1903 -1.041786 
 1904 -1.092865 
 1905 -0.778003 
 1906 -0.6398994 
 1907 -0.900361 
 1908 -0.8799808 
 1909 -0.7371712 
 1910 -0.6564547 
 1911 -0.7273777 
 1912 -1.180326 
 1913 -1.119487 
 1914 -0.8706478 
 1915 -0.7338391 
 1916 -0.8025689 
 1917 -0.5953029 
 1918 -0.3023704 
 1919 -0.3829085 
 1920 -0.3556492 
 1921 -0.3132066 
 1922 -0.363229 
 1923 -0.2925219 
 1924 -0.4071787 
 1925 -0.3941448 
 1926 -0.3804965 
 1927 -0.2177135 
 1928 -0.1842096 
 1929 -0.1604781 
 1930 -0.4132041 
 1931 -0.2326578 
 1932 -0.4083147 
 1933 -0.4579032 
 1934 -0.3787731 
 1935 -0.4235993 
 1936 -0.4335952 
 1937 -0.291344 
 1938 -0.202522 
 1939 -0.3054553 
 1940 -0.2999843 
 1941 -0.05830635 
 1942 -0.30269 
 1943 -0.1980011 
 1944 -0.2842213 
 1945 -0.05958711 
 1946 -0.33595 
 1947 -0.2495163 
 1948 -0.2482249 
 1949 -0.1301359 
 1950 -0.1074414 
 1951 -0.07192508 
 1952 -0.199922 
 1953 -0.2076648 
 1954 -0.196172 
 1955 -0.2562511 
 1956 -0.2657626 
 1957 -0.1923278 
 1958 -0.2817422 
 1959 -0.02042267 
 1960 -0.189379 
 1961 -0.115601 
 1962 -0.06393857 
 1963 -0.1656028 
 1964 -0.3158945 
 1965 -0.5315214 
 1966 -0.3872115 
 1967 -0.2399042 
 1968 -0.3572894 
 1969 -0.1258968 
 1970 -0.2117825 
 1971 -0.08596975 
 1972 -0.1940612 
 1973 0.007469957 
 1974 -0.1399286 
 1975 -0.03803555 
 1976 -0.08762366 
 1977 -0.01111462 
 1978 0.3119266 
 1979 0.3075713 
 1980 0.2547779 
 1981  0.41463 
 1982 0.1091538 
 1983 -0.1716793 
 1984 0.004356069 
 1985 0.1948849 
 1986 0.1214736 
 1987 0.450397 
 1988 0.5480353 
 1989 0.4883067 
 1990 0.8949828 
 1991 0.747629 
 1992 0.2230382 
 1993 0.4060894 
 1994 0.4700133 
 1995 0.7670324 
 1996 0.917459 
 1997 0.9128062 
 1998 1.161415 
 1999 1.225852 
 2000 1.297216 
 2001 1.291234 
 2002 1.589615 
 2003 1.482483 
 2004  1.57085 
 2005 1.583572