# year    value 
 1900 -13.73062 
 1901 -13.50016 
 1902 -13.46878 
 1903 -13.80954 
 1904 -13.7436 
 1905 -13.75685 
 1906 -13.63771 
 1907 -13.49332 
 1908 -13.50093 
 1909 -13.6187 
 1910 -13.50391 
 1911 -13.50002 
 1912 -13.44121 
 1913 -13.75168 
 1914 -13.67858 
 1915 -13.55544 
 1916 -13.53734 
 1917 -13.51371 
 1918 -13.53706 
 1919 -13.48624 
 1920 -13.46575 
 1921 -13.38589 
 1922 -13.33973 
 1923 -13.44017 
 1924 -13.37927 
 1925 -13.29497 
 1926 -13.2627 
 1927 -13.40469 
 1928 -13.25953 
 1929 -13.42687 
 1930 -13.35764 
 1931 -13.28643 
 1932 -13.31237 
 1933 -13.41766 
 1934 -13.38094 
 1935 -13.43834 
 1936 -13.2361 
 1937 -13.38118 
 1938 -13.20509 
 1939 -13.29277 
 1940 -13.30015 
 1941 -13.24679 
 1942 -13.21024 
 1943 -13.13573 
 1944 -13.18277 
 1945 -13.31322 
 1946 -13.30537 
 1947 -13.2962 
 1948 -13.24651 
 1949 -13.32062 
 1950 -13.29088 
 1951 -13.35621 
 1952 -13.44904 
 1953 -13.11937 
 1954 -13.36895 
 1955 -13.20316 
 1956 -13.27535 
 1957 -13.40285 
 1958 -13.37021 
 1959 -13.21551 
 1960 -13.27129 
 1961  -13.188 
 1962 -13.09315 
 1963 -13.22053 
 1964 -13.53741 
 1965 -13.50717 
 1966 -13.41674 
 1967 -13.49968 
 1968 -13.48601 
 1969 -13.54744 
 1970 -13.36481 
 1971 -13.31661 
 1972 -13.33093 
 1973 -13.24609 
 1974 -13.15892 
 1975 -13.23557 
 1976 -13.3188 
 1977 -13.1184 
 1978 -13.07363 
 1979 -13.09672 
 1980 -13.13772 
 1981 -12.84453 
 1982 -12.96049 
 1983 -13.32505 
 1984 -13.06642 
 1985 -13.28531 
 1986 -13.04632 
 1987 -12.93154 
 1988 -12.85871 
 1989 -12.87851 
 1990 -12.6279 
 1991 -12.71375 
 1992 -13.04463 
 1993 -13.14516 
 1994 -13.11794 
 1995 -12.89155 
 1996 -12.57208 
 1997 -12.72287 
 1998 -12.64143 
 1999 -12.8672 
 2000 -12.56201 
 2001 -12.44028 
 2002 -12.45906 
 2003 -12.18547 
 2004 -12.27561 
 2005 -12.24552