# year    value 
 1900 -3.155263 
 1901 -3.323819 
 1902 -3.223513 
 1903 -3.556495 
 1904 -3.481592 
 1905 -3.640181 
 1906 -3.639094 
 1907 -3.51446 
 1908 -3.422555 
 1909 -3.403461 
 1910 -3.540195 
 1911 -3.577253 
 1912 -3.426809 
 1913 -3.574274 
 1914 -3.550902 
 1915 -3.584405 
 1916 -3.296271 
 1917 -3.305239 
 1918 -3.264067 
 1919 -3.347122 
 1920 -3.153468 
 1921 -3.042941 
 1922 -3.289881 
 1923 -3.070393 
 1924 -3.203273 
 1925 -3.269605 
 1926 -3.133644 
 1927 -3.174405 
 1928 -2.792576 
 1929 -3.201323 
 1930 -3.081742 
 1931 -3.031737 
 1932 -3.128536 
 1933 -3.35752 
 1934 -3.059265 
 1935 -3.17041 
 1936 -3.159611 
 1937 -2.89613 
 1938 -2.98894 
 1939 -3.011637 
 1940 -2.815533 
 1941 -2.96069 
 1942 -3.086976 
 1943 -3.113242 
 1944 -3.157511 
 1945 -2.928278 
 1946 -3.047558 
 1947 -2.982293 
 1948 -2.870582 
 1949 -3.013949 
 1950 -2.857341 
 1951 -2.897092 
 1952 -2.950459 
 1953 -3.013789 
 1954 -2.904817 
 1955 -2.926857 
 1956 -2.886456 
 1957 -2.845195 
 1958 -2.939253 
 1959 -3.097714 
 1960 -2.825812 
 1961 -2.854304 
 1962 -2.954912 
 1963 -3.061609 
 1964 -3.038847 
 1965 -2.912557 
 1966 -3.062272 
 1967 -3.002565 
 1968 -2.899075 
 1969 -3.051511 
 1970 -3.032815 
 1971 -2.937713 
 1972 -2.797862 
 1973 -2.90567 
 1974 -2.764101 
 1975 -2.887889 
 1976 -2.829571 
 1977 -2.819169 
 1978 -2.800822 
 1979 -2.536219 
 1980 -2.577086 
 1981 -2.454636 
 1982 -2.758264 
 1983 -2.829879 
 1984 -2.612897 
 1985 -2.714996 
 1986 -2.727812 
 1987 -2.406419 
 1988 -2.449687 
 1989 -2.447562 
 1990 -2.166356 
 1991 -2.279557 
 1992 -2.297681 
 1993 -2.366648 
 1994 -2.271209 
 1995 -2.405993 
 1996 -2.260756 
 1997 -2.073008 
 1998 -1.997931 
 1999 -1.908158 
 2000 -1.790878 
 2001 -1.597328 
 2002 -1.764798 
 2003 -1.727901 
 2004 -1.756072 
 2005 -1.392938