# year    value 
 1900 -0.5744061 
 1901 -0.5614813 
 1902 -0.5780433 
 1903 -0.7403011 
 1904 -0.7180175 
 1905 -0.6643314 
 1906 -0.587311 
 1907 -0.5430286 
 1908 -0.5432388 
 1909 -0.5287696 
 1910 -0.4865645 
 1911 -0.5001206 
 1912 -0.4636444 
 1913 -0.5382496 
 1914 -0.4927002 
 1915 -0.4921802 
 1916 -0.4770266 
 1917 -0.4482603 
 1918 -0.4356129 
 1919 -0.4661642 
 1920 -0.4620039 
 1921 -0.4428259 
 1922 -0.4795005 
 1923 -0.4638094 
 1924 -0.4657037 
 1925 -0.3977818 
 1926 -0.4392115 
 1927 -0.429359 
 1928 -0.3899109 
 1929 -0.4431558 
 1930 -0.4062055 
 1931 -0.4406825 
 1932 -0.4153203 
 1933 -0.4402891 
 1934 -0.4101187 
 1935 -0.4100129 
 1936 -0.3953321 
 1937 -0.3864497 
 1938 -0.3695926 
 1939 -0.3454114 
 1940 -0.3601647 
 1941 -0.3467538 
 1942 -0.3804982 
 1943 -0.4327196 
 1944 -0.3636207 
 1945 -0.3553626 
 1946 -0.3631268 
 1947 -0.3572022 
 1948 -0.3361969 
 1949 -0.3039498 
 1950 -0.3356857 
 1951 -0.3452058 
 1952 -0.3763713 
 1953 -0.3268877 
 1954 -0.3212649 
 1955 -0.3378122 
 1956 -0.3200411 
 1957 -0.3100077 
 1958 -0.3165097 
 1959 -0.2754975 
 1960 -0.310989 
 1961 -0.2943055 
 1962 -0.3438516 
 1963 -0.4169848 
 1964 -0.5378688 
 1965 -0.4712632 
 1966 -0.4259833 
 1967 -0.3470858 
 1968 -0.3619287 
 1969 -0.3618753 
 1970 -0.3459723 
 1971 -0.2745533 
 1972 -0.249233 
 1973 -0.280558 
 1974 -0.2817952 
 1975 -0.2981304 
 1976 -0.2980384 
 1977 -0.2119183 
 1978 -0.2240325 
 1979 -0.1647378 
 1980 -0.1450067 
 1981 -0.1155533 
 1982 -0.2031944 
 1983 -0.2835977 
 1984 -0.1962921 
 1985 -0.1685063 
 1986 -0.1776831 
 1987 -0.1417747 
 1988 -0.1007147 
 1989 -0.04387369 
 1990 -0.03058946 
 1991 -0.07439228 
 1992 -0.281226 
 1993 -0.1967184 
 1994 -0.1145439 
 1995 -0.07388073 
 1996 -0.01253068 
 1997 0.03619914 
 1998 0.07689531 
 1999 0.09066902 
 2000 0.09518114 
 2001 0.1747608 
 2002 0.1985219 
 2003 0.1943449 
 2004 0.148586 
 2005 -0.08249745