# year    value 
 1900 -6.647891 
 1901 -6.495432 
 1902 -6.472676 
 1903 -6.691288 
 1904 -6.740424 
 1905 -6.670511 
 1906 -6.628073 
 1907 -6.579151 
 1908 -6.598594 
 1909 -6.561565 
 1910 -6.573029 
 1911 -6.491921 
 1912 -6.485608 
 1913 -6.611667 
 1914 -6.627539 
 1915 -6.572802 
 1916 -6.512372 
 1917 -6.480209 
 1918 -6.440658 
 1919 -6.449081 
 1920 -6.413712 
 1921 -6.394642 
 1922 -6.342256 
 1923 -6.341078 
 1924 -6.391831 
 1925 -6.36191 
 1926 -6.346191 
 1927 -6.327376 
 1928 -6.324789 
 1929 -6.373046 
 1930 -6.336854 
 1931 -6.358924 
 1932 -6.307282 
 1933 -6.390872 
 1934 -6.398597 
 1935 -6.380131 
 1936 -6.296575 
 1937 -6.286167 
 1938 -6.26791 
 1939 -6.28367 
 1940 -6.303571 
 1941 -6.326985 
 1942 -6.277881 
 1943 -6.23831 
 1944 -6.235699 
 1945 -6.218528 
 1946 -6.314877 
 1947 -6.298963 
 1948 -6.230824 
 1949 -6.199244 
 1950 -6.227851 
 1951 -6.251163 
 1952 -6.268147 
 1953 -6.19597 
 1954 -6.229575 
 1955 -6.239843 
 1956 -6.235236 
 1957 -6.199965 
 1958 -6.236323 
 1959 -6.192186 
 1960 -6.213201 
 1961 -6.177705 
 1962 -6.219301 
 1963 -6.262434 
 1964 -6.446744 
 1965 -6.447919 
 1966 -6.372162 
 1967 -6.443758 
 1968 -6.354025 
 1969 -6.374331 
 1970 -6.315698 
 1971 -6.291601 
 1972 -6.206895 
 1973 -6.179261 
 1974 -6.157094 
 1975 -6.201838 
 1976 -6.205763 
 1977 -6.174251 
 1978 -6.105107 
 1979 -6.028513 
 1980 -5.98771 
 1981 -5.887188 
 1982 -5.892447 
 1983 -6.216211 
 1984 -6.100028 
 1985 -6.06597 
 1986 -6.015366 
 1987 -5.891641 
 1988 -5.821685 
 1989 -5.852087 
 1990 -5.700347 
 1991 -5.680387 
 1992 -6.034827 
 1993  -5.9733 
 1994 -5.944097 
 1995 -5.875429 
 1996 -5.72564 
 1997 -5.698005 
 1998 -5.563222 
 1999 -5.625099 
 2000  -5.5168 
 2001 -5.435566 
 2002 -5.338197 
 2003 -5.262258 
 2004 -5.316644 
 2005 -5.236373