# year    value 
 1900 -0.2526911 
 1901 -0.1089244 
 1902 -0.05473728 
 1903 -0.535893 
 1904 -0.2601092 
 1905 -0.416938 
 1906 -0.1477878 
 1907 -0.3896188 
 1908 0.02736733 
 1909 0.009108992 
 1910 -0.002401972 
 1911 -0.1142647 
 1912 -0.515651 
 1913 -0.3008941 
 1914 -0.07233937 
 1915 -0.05952606 
 1916 -0.1819723 
 1917 0.2085666 
 1918 0.2767118 
 1919 -0.245366 
 1920 -0.2745504 
 1921 -0.1109514 
 1922 -0.1357789 
 1923 -0.1134275 
 1924 0.1779283 
 1925 0.005654494 
 1926 -0.107914 
 1927 0.07919247 
 1928 -0.1324668 
 1929 -0.1711095 
 1930 0.1057676 
 1931 0.06537396 
 1932 -0.00581703 
 1933 0.08563192 
 1934 0.02908035 
 1935 0.05186755 
 1936 -0.04913089 
 1937 0.1254298 
 1938 -0.1895791 
 1939 0.08054925 
 1940 0.1278866 
 1941 0.1865762 
 1942 -0.2251099 
 1943 0.03728187 
 1944 0.1143374 
 1945 0.08231228 
 1946 -0.09303492 
 1947 -0.1865413 
 1948 0.02827363 
 1949 0.1633165 
 1950 0.1147132 
 1951 0.03339497 
 1952 -0.06690154 
 1953 0.3193819 
 1954 0.2045948 
 1955 0.1547228 
 1956 -0.07009545 
 1957 0.1203623 
 1958 -0.191466 
 1959 -0.2343227 
 1960 0.0558519 
 1961 -0.05078714 
 1962 0.1798337 
 1963 -0.1383909 
 1964 -0.345867 
 1965 -0.2944443 
 1966 -0.1919618 
 1967 -0.251764 
 1968 -0.1993524 
 1969 -0.3435981 
 1970 0.05648159 
 1971 0.1031272 
 1972 0.09206545 
 1973 -0.1487051 
 1974 0.2767542 
 1975 0.08139127 
 1976 0.09899002 
 1977 -0.01438125 
 1978 0.007590388 
 1979 0.2188705 
 1980 0.1710949 
 1981 0.2385433 
 1982 -0.04413318 
 1983 -0.2758981 
 1984 0.07283679 
 1985 0.3560035 
 1986 0.401785 
 1987 0.4740825 
 1988 0.5844826 
 1989 0.4075772 
 1990 0.3122299 
 1991 0.1045254 
 1992 -0.2680719 
 1993 0.2564551 
 1994 0.5303617 
 1995 0.4628832 
 1996 0.3572873 
 1997 0.8028158 
 1998 0.7030505 
 1999 0.6946239 
 2000 0.9610432 
 2001 0.8212214 
 2002  1.00408 
 2003 0.9732178 
 2004 0.8791924 
 2005 0.7514011