# year    value 
 1900 -0.4488085 
 1901 -0.5455955 
 1902 -0.5394228 
 1903 -0.8028575 
 1904 -0.7289042 
 1905 -0.588989 
 1906 -0.5796587 
 1907 -0.5158475 
 1908 -0.5553837 
 1909 -0.4450295 
 1910 -0.4886923 
 1911 -0.4347221 
 1912 -0.4427143 
 1913 -0.5139299 
 1914 -0.4777404 
 1915 -0.4346285 
 1916 -0.3794343 
 1917 -0.3768014 
 1918 -0.4417127 
 1919 -0.4531555 
 1920 -0.3984575 
 1921 -0.3574086 
 1922 -0.3811051 
 1923 -0.3631643 
 1924 -0.382741 
 1925 -0.3053908 
 1926 -0.3797813 
 1927 -0.2962816 
 1928 -0.3206476 
 1929 -0.3759481 
 1930 -0.3842239 
 1931 -0.3618417 
 1932 -0.3551536 
 1933 -0.3578849 
 1934 -0.4529441 
 1935 -0.3237041 
 1936 -0.2345361 
 1937 -0.2853988 
 1938 -0.2630453 
 1939 -0.2363631 
 1940 -0.3149822 
 1941 -0.299943 
 1942 -0.2082817 
 1943 -0.2398213 
 1944 -0.1941192 
 1945 -0.2263523 
 1946 -0.3292024 
 1947 -0.2762786 
 1948 -0.244828 
 1949 -0.1394794 
 1950 -0.2536698 
 1951 -0.2293896 
 1952 -0.2247816 
 1953 -0.2981645 
 1954 -0.2057987 
 1955 -0.2970575 
 1956 -0.2010467 
 1957 -0.227625 
 1958 -0.2540922 
 1959 -0.2238849 
 1960 -0.195756 
 1961 -0.1641752 
 1962 -0.2204425 
 1963 -0.2912812 
 1964 -0.5825669 
 1965 -0.4196471 
 1966 -0.4086011 
 1967 -0.3756318 
 1968 -0.3326006 
 1969 -0.3357981 
 1970 -0.2766243 
 1971 -0.1607212 
 1972 -0.1908501 
 1973 -0.174449 
 1974 -0.2183516 
 1975 -0.2048345 
 1976 -0.137937 
 1977 -0.1524702 
 1978 -0.1132127 
 1979 -0.1121203 
 1980 0.0102773 
 1981 0.03664802 
 1982 -0.05058773 
 1983 -0.2527168 
 1984 -0.08669002 
 1985 -0.06186266 
 1986 -0.1087635 
 1987 -0.0136744 
 1988 0.1302125 
 1989 0.0948829 
 1990 0.1689509 
 1991 0.1689262 
 1992 -0.2372446 
 1993 -0.01762387 
 1994 -0.02865849 
 1995 -0.006408831 
 1996 0.150011 
 1997 0.211299 
 1998 0.2348972 
 1999 0.2855337 
 2000 0.249959 
 2001 0.3770877 
 2002 0.4918775 
 2003 0.3378129 
 2004 0.3594814 
 2005 0.4728776