# year    value 
 1900 -7.206802 
 1901 -7.066897 
 1902 -7.050671 
 1903 -7.282599 
 1904 -7.32058 
 1905 -7.258452 
 1906 -7.204179 
 1907 -7.149105 
 1908 -7.160704 
 1909 -7.139198 
 1910 -7.142462 
 1911 -7.062591 
 1912 -7.057743 
 1913 -7.193838 
 1914 -7.208895 
 1915 -7.144256 
 1916 -7.078043 
 1917 -7.054951 
 1918 -7.019526 
 1919 -7.028033 
 1920 -6.982554 
 1921 -6.974145 
 1922 -6.925401 
 1923 -6.918591 
 1924 -6.959833 
 1925 -6.924724 
 1926 -6.910122 
 1927 -6.902183 
 1928 -6.896189 
 1929 -6.954002 
 1930 -6.917448 
 1931 -6.927254 
 1932 -6.890416 
 1933 -6.966419 
 1934 -6.972101 
 1935 -6.958654 
 1936 -6.865379 
 1937 -6.870744 
 1938 -6.840344 
 1939 -6.856168 
 1940 -6.877756 
 1941 -6.894553 
 1942 -6.847104 
 1943 -6.803755 
 1944 -6.802816 
 1945 -6.801418 
 1946 -6.882593 
 1947 -6.871825 
 1948 -6.799183 
 1949 -6.78288 
 1950 -6.808643 
 1951 -6.833016 
 1952 -6.856741 
 1953 -6.764725 
 1954 -6.82171 
 1955 -6.814981 
 1956 -6.814653 
 1957 -6.792441 
 1958 -6.822493 
 1959 -6.769953 
 1960 -6.785554 
 1961 -6.756914 
 1962 -6.779435 
 1963 -6.825989 
 1964 -7.030559 
 1965 -7.033243 
 1966 -6.94659 
 1967 -7.018626 
 1968 -6.940422 
 1969 -6.963583 
 1970 -6.890954 
 1971 -6.864974 
 1972 -6.787551 
 1973 -6.756211 
 1974 -6.728401 
 1975 -6.775328 
 1976 -6.785069 
 1977 -6.739033 
 1978 -6.674782 
 1979 -6.610883 
 1980 -6.575469 
 1981 -6.462042 
 1982 -6.479317 
 1983 -6.80027 
 1984 -6.668444 
 1985 -6.658237 
 1986 -6.589413 
 1987 -6.474824 
 1988 -6.395586 
 1989 -6.42779 
 1990 -6.272882 
 1991 -6.257852 
 1992 -6.611885 
 1993 -6.557889 
 1994 -6.537889 
 1995 -6.453822 
 1996 -6.287114 
 1997 -6.26931 
 1998 -6.149361 
 1999 -6.217605 
 2000 -6.09384 
 2001 -6.005818 
 2002 -5.926392 
 2003 -5.831306 
 2004 -5.89214 
 2005 -5.810888