# year    value 
 1900 -0.370288 
 1901 -0.407862 
 1902 -0.4106653 
 1903 -0.674831 
 1904 -0.5605457 
 1905 -0.5007678 
 1906 -0.4254958 
 1907 -0.4231373 
 1908 -0.3865111 
 1909 -0.4042729 
 1910 -0.3734203 
 1911 -0.3632849 
 1912 -0.410194 
 1913 -0.4529333 
 1914 -0.3719317 
 1915 -0.3436185 
 1916 -0.3116602 
 1917 -0.3103845 
 1918 -0.3007696 
 1919 -0.2515839 
 1920 -0.2465659 
 1921 -0.2816392 
 1922 -0.2345048 
 1923 -0.2604541 
 1924 -0.2521306 
 1925 -0.2662602 
 1926 -0.2323208 
 1927 -0.2090173 
 1928 -0.2539984 
 1929 -0.2758354 
 1930 -0.2469755 
 1931 -0.2438912 
 1932 -0.2477101 
 1933 -0.2831067 
 1934 -0.3104418 
 1935 -0.1630182 
 1936 -0.1896966 
 1937 -0.1322628 
 1938 -0.1491098 
 1939 -0.165566 
 1940 -0.2619345 
 1941 -0.203903 
 1942 -0.1446896 
 1943 -0.1371346 
 1944 -0.1350202 
 1945 -0.1966478 
 1946 -0.1667281 
 1947 -0.1457604 
 1948 -0.09194454 
 1949 -0.1466099 
 1950 -0.1561003 
 1951 -0.1493405 
 1952 -0.1565952 
 1953 -0.171373 
 1954 -0.1785101 
 1955 -0.1586962 
 1956 -0.1259686 
 1957 -0.1476932 
 1958 -0.08023823 
 1959 -0.1171358 
 1960 -0.1242338 
 1961 -0.1537043 
 1962 -0.1830023 
 1963 -0.3439351 
 1964 -0.4465848 
 1965 -0.3536318 
 1966 -0.2873347 
 1967 -0.2820344 
 1968 -0.278328 
 1969 -0.2754068 
 1970 -0.2027141 
 1971 -0.1137815 
 1972 -0.1458493 
 1973 -0.09199008 
 1974 -0.1392276 
 1975 -0.1035765 
 1976 -0.1142612 
 1977 -0.09835115 
 1978 -0.07097486 
 1979 0.01470385 
 1980 0.05326766 
 1981 0.07053355 
 1982 -0.2049624 
 1983 -0.1126024 
 1984 -0.03379564 
 1985 0.01439428 
 1986 0.06077836 
 1987 0.1079696 
 1988 0.1464425 
 1989 0.274839 
 1990 0.2517774 
 1991 -0.04710529 
 1992 -0.08881222 
 1993 0.008846045 
 1994 0.08220691 
 1995 0.1890507 
 1996 0.2606096 
 1997 0.3309614 
 1998 0.3589905 
 1999 0.3763751 
 2000 0.4341958 
 2001 0.5665314 
 2002 0.5072348 
 2003 0.5284991 
 2004 0.5388701 
 2005 0.6316937