# year    value 
 1900 -3.025429 
 1901 -3.208837 
 1902 -3.102674 
 1903 -3.42084 
 1904 -3.346503 
 1905 -3.497028 
 1906 -3.555602 
 1907 -3.400108 
 1908 -3.290988 
 1909 -3.287797 
 1910 -3.403005 
 1911 -3.446848 
 1912 -3.292819 
 1913 -3.457685 
 1914 -3.40311 
 1915 -3.441597 
 1916 -3.162417 
 1917 -3.190334 
 1918 -3.156649 
 1919 -3.238297 
 1920  -2.9959 
 1921 -2.928085 
 1922 -3.166004 
 1923 -2.960304 
 1924 -3.083808 
 1925 -3.134617 
 1926 -3.014918 
 1927 -3.081071 
 1928 -2.680582 
 1929 -3.093293 
 1930 -2.949119 
 1931 -2.950203 
 1932 -3.032331 
 1933 -3.249534 
 1934 -2.931128 
 1935 -3.058917 
 1936 -3.039096 
 1937 -2.797754 
 1938 -2.866667 
 1939 -2.89207 
 1940 -2.707988 
 1941 -2.843387 
 1942 -2.976951 
 1943 -2.976132 
 1944 -3.02767 
 1945 -2.826172 
 1946 -2.929425 
 1947 -2.859707 
 1948 -2.767717 
 1949 -2.913034 
 1950 -2.756965 
 1951 -2.779576 
 1952 -2.839249 
 1953 -2.905556 
 1954 -2.769131 
 1955 -2.835503 
 1956 -2.778361 
 1957 -2.709306 
 1958 -2.828061 
 1959  -2.9616 
 1960 -2.696291 
 1961 -2.723289 
 1962 -2.863354 
 1963 -2.942348 
 1964 -2.920046 
 1965 -2.814524 
 1966 -2.942243 
 1967 -2.897672 
 1968 -2.760589 
 1969 -2.897143 
 1970 -2.884375 
 1971 -2.782948 
 1972 -2.67596 
 1973 -2.780612 
 1974 -2.646612 
 1975 -2.750107 
 1976 -2.712216 
 1977 -2.716645 
 1978 -2.681717 
 1979 -2.445194 
 1980 -2.457738 
 1981 -2.375418 
 1982 -2.652431 
 1983 -2.711035 
 1984 -2.497299 
 1985 -2.61686 
 1986 -2.597839 
 1987 -2.286181 
 1988 -2.351725 
 1989 -2.310798 
 1990 -2.055843 
 1991 -2.176688 
 1992 -2.200572 
 1993 -2.260463 
 1994 -2.203813 
 1995 -2.317433 
 1996 -2.172092 
 1997 -1.97409 
 1998 -1.886966 
 1999 -1.825432 
 2000 -1.682919 
 2001 -1.477048 
 2002 -1.653025 
 2003 -1.634676 
 2004 -1.667335 
 2005 -1.300009