# year    value 
 1900 -0.3333105 
 1901 -0.3658003 
 1902 -0.3732611 
 1903 -0.6305031 
 1904 -0.5258858 
 1905 -0.4610243 
 1906 -0.3867066 
 1907 -0.3874008 
 1908 -0.3419834 
 1909 -0.3681194 
 1910 -0.3406835 
 1911 -0.3292724 
 1912 -0.3642814 
 1913 -0.4116942 
 1914 -0.3319332 
 1915 -0.3071807 
 1916 -0.2761516 
 1917 -0.2800772 
 1918 -0.2633244 
 1919 -0.2191506 
 1920 -0.2158529 
 1921 -0.2432698 
 1922 -0.2019556 
 1923 -0.2163742 
 1924 -0.2161446 
 1925  -0.2318 
 1926 -0.202288 
 1927 -0.1717106 
 1928 -0.215389 
 1929 -0.2367219 
 1930 -0.207843 
 1931 -0.2128801 
 1932 -0.2034017 
 1933 -0.2487321 
 1934 -0.2723952 
 1935 -0.1325187 
 1936 -0.1538361 
 1937 -0.09060822 
 1938 -0.1074396 
 1939 -0.1339563 
 1940 -0.2246758 
 1941 -0.1607285 
 1942 -0.1024306 
 1943 -0.09835403 
 1944 -0.0957839 
 1945 -0.1519362 
 1946 -0.1291915 
 1947 -0.1143997 
 1948 -0.05036242 
 1949 -0.1127078 
 1950 -0.1160945 
 1951 -0.1108844 
 1952 -0.1150235 
 1953 -0.1282344 
 1954 -0.1343976 
 1955 -0.1207288 
 1956 -0.09085333 
 1957 -0.1106567 
 1958 -0.03764124 
 1959 -0.07634323 
 1960 -0.07983844 
 1961 -0.1111659 
 1962 -0.1388365 
 1963 -0.2973053 
 1964 -0.4033535 
 1965 -0.3156849 
 1966 -0.2407983 
 1967 -0.2411952 
 1968 -0.2316063 
 1969 -0.2283013 
 1970 -0.1573772 
 1971 -0.07438456 
 1972 -0.1053279 
 1973 -0.04482989 
 1974 -0.09701178 
 1975 -0.06215597 
 1976 -0.06880461 
 1977 -0.05422847 
 1978 -0.0215075 
 1979 0.04875568 
 1980 0.09643736 
 1981 0.1105092 
 1982 -0.1514446 
 1983 -0.06693216 
 1984 0.01340199 
 1985 0.06277448 
 1986 0.1025975 
 1987 0.1483958 
 1988 0.1937795 
 1989 0.3186398 
 1990 0.2958082 
 1991 -0.0004822413 
 1992 -0.04070478 
 1993 0.04877567 
 1994 0.1223206 
 1995 0.2404761 
 1996 0.300203 
 1997 0.3765863 
 1998 0.4002398 
 1999 0.4211512 
 2000 0.4774189 
 2001 0.6118762 
 2002 0.5548643 
 2003 0.5742601 
 2004 0.587331 
 2005 0.6763392