# year    value 
 1900 -9.574222 
 1901 -9.487488 
 1902 -9.498924 
 1903 -9.787256 
 1904 -9.777988 
 1905 -9.748833 
 1906 -9.644432 
 1907 -9.563293 
 1908 -9.541667 
 1909 -9.585918 
 1910 -9.554448 
 1911 -9.479817 
 1912 -9.481169 
 1913 -9.659781 
 1914 -9.671382 
 1915 -9.564801 
 1916 -9.474096 
 1917 -9.489424 
 1918 -9.471475 
 1919 -9.480339 
 1920 -9.392037 
 1921 -9.428785 
 1922 -9.395471 
 1923 -9.364801 
 1924 -9.365754 
 1925 -9.308674 
 1926  -9.2988 
 1927 -9.336933 
 1928 -9.316506 
 1929 -9.414796 
 1930 -9.376706 
 1931 -9.334566 
 1932 -9.360436 
 1933 -9.404301 
 1934 -9.401327 
 1935 -9.409142 
 1936  -9.2747 
 1937 -9.346874 
 1938 -9.26504 
 1939 -9.281137 
 1940 -9.309872 
 1941 -9.298637 
 1942 -9.258196 
 1943 -9.198847 
 1944 -9.204989 
 1945 -9.270403 
 1946 -9.287308 
 1947 -9.298336 
 1948 -9.206625 
 1949 -9.255026 
 1950 -9.268743 
 1951 -9.297609 
 1952 -9.349887 
 1953 -9.17384 
 1954 -9.329853 
 1955 -9.251127 
 1956 -9.268929 
 1957 -9.30203 
 1958 -9.305373 
 1959 -9.217236 
 1960 -9.209909 
 1961 -9.210307 
 1962 -9.152033 
 1963 -9.213078 
 1964 -9.50346 
 1965 -9.512539 
 1966 -9.379735 
 1967 -9.453634 
 1968 -9.424262 
 1969 -9.459517 
 1970 -9.327605 
 1971 -9.293649 
 1972 -9.247076 
 1973 -9.200039 
 1974 -9.148324 
 1975 -9.204496 
 1976 -9.238873 
 1977 -9.131316 
 1978 -9.087792 
 1979 -9.077666 
 1980 -9.065081 
 1981 -8.896985 
 1982 -8.965164 
 1983 -9.274208 
 1984 -9.076119 
 1985 -9.166939 
 1986 -9.020942 
 1987 -8.945055 
 1988 -8.826496 
 1989 -8.866329 
 1990 -8.698008 
 1991 -8.703855 
 1992 -9.056165 
 1993 -9.034071 
 1994 -9.053057 
 1995 -8.903757 
 1996 -8.665386 
 1997 -8.689226 
 1998 -8.63211 
 1999 -8.727322 
 2000 -8.538046 
 2001 -8.42127 
 2002 -8.41785 
 2003 -8.241665 
 2004 -8.329809 
 2005 -8.244399