# year    value 
 1900 -0.6160321 
 1901 -0.6814361 
 1902 -0.7301649 
 1903 -0.9225929 
 1904 -0.845659 
 1905 -0.7551675 
 1906 -0.7180048 
 1907 -0.6822353 
 1908 -0.6864756 
 1909 -0.6544722 
 1910 -0.6432075 
 1911 -0.6032624 
 1912 -0.6031019 
 1913 -0.6658604 
 1914 -0.6456575 
 1915 -0.5848051 
 1916 -0.5637084 
 1917 -0.5803845 
 1918 -0.5687951 
 1919 -0.5821647 
 1920 -0.533412 
 1921 -0.5279145 
 1922 -0.5167651 
 1923 -0.5257999 
 1924 -0.5294428 
 1925 -0.5085431 
 1926 -0.5234722 
 1927 -0.4687259 
 1928 -0.4635703 
 1929 -0.521554 
 1930 -0.5362273 
 1931 -0.5275563 
 1932 -0.5027759 
 1933 -0.5594771 
 1934 -0.6030186 
 1935 -0.4571886 
 1936 -0.4110643 
 1937 -0.4302823 
 1938 -0.4189644 
 1939 -0.4194697 
 1940 -0.4651765 
 1941 -0.4345174 
 1942 -0.4082227 
 1943 -0.4165558 
 1944 -0.377045 
 1945 -0.418657 
 1946 -0.4598603 
 1947 -0.4292333 
 1948 -0.388217 
 1949 -0.341491 
 1950 -0.4297042 
 1951 -0.3850177 
 1952 -0.3985263 
 1953 -0.428543 
 1954 -0.402444 
 1955 -0.4272689 
 1956 -0.3639947 
 1957 -0.3710386 
 1958 -0.3979361 
 1959 -0.3777324 
 1960 -0.3591146 
 1961 -0.364003 
 1962 -0.4161309 
 1963 -0.5434547 
 1964 -0.7391223 
 1965 -0.5879364 
 1966 -0.5371016 
 1967 -0.5305026 
 1968 -0.5079917 
 1969 -0.5081342 
 1970 -0.4670546 
 1971 -0.3622555 
 1972 -0.3749948 
 1973 -0.3579588 
 1974 -0.3805017 
 1975 -0.371417 
 1976 -0.3246798 
 1977 -0.3342753 
 1978 -0.2942625 
 1979 -0.2468495 
 1980 -0.1542254 
 1981 -0.1656561 
 1982 -0.2951463 
 1983 -0.3930335 
 1984 -0.2644926 
 1985 -0.2605593 
 1986 -0.2539892 
 1987 -0.1649092 
 1988 -0.05583301 
 1989 -0.06221392 
 1990 0.01598644 
 1991 -0.1427823 
 1992 -0.3579248 
 1993 -0.221884 
 1994 -0.2097573 
 1995 -0.1580961 
 1996 -4.094094e-05 
 1997 0.05021625 
 1998 0.09145526 
 1999 0.1046738 
 2000 0.126177 
 2001 0.225945 
 2002 0.2947931 
 2003 0.2019183 
 2004 0.2271626 
 2005 0.147212