# year    value 
 1900 -10.44385 
 1901 -10.4656 
 1902 -10.51823 
 1903 -10.73949 
 1904 -11.18042 
 1905 -10.9472 
 1906 -10.78964 
 1907 -10.49386 
 1908 -10.22027 
 1909 -10.62199 
 1910 -10.70709 
 1911 -10.92926 
 1912 -10.79489 
 1913 -10.75068 
 1914 -10.58363 
 1915 -10.24428 
 1916 -10.88197 
 1917 -10.68107 
 1918 -10.38802 
 1919 -10.6128 
 1920 -10.51494 
 1921 -10.10698 
 1922 -10.45891 
 1923 -10.33733 
 1924 -10.82278 
 1925 -10.15482 
 1926 -10.36161 
 1927 -10.4296 
 1928 -10.71133 
 1929 -10.47403 
 1930 -10.78372 
 1931 -10.4731 
 1932 -10.28958 
 1933 -10.56369 
 1934  -10.726 
 1935 -10.61727 
 1936 -10.51441 
 1937 -10.54361 
 1938 -10.23147 
 1939 -10.37398 
 1940 -10.62708 
 1941 -10.29733 
 1942 -10.40258 
 1943 -10.08134 
 1944 -10.38171 
 1945  -10.594 
 1946 -10.46728 
 1947 -10.48925 
 1948 -10.52949 
 1949 -10.4521 
 1950 -10.62299 
 1951 -10.20827 
 1952 -10.47416 
 1953 -10.01972 
 1954 -10.29465 
 1955 -10.72123 
 1956 -10.20989 
 1957 -10.62185 
 1958 -10.42116 
 1959 -10.23447 
 1960 -10.23656 
 1961 -10.29128 
 1962 -10.30477 
 1963 -10.09368 
 1964 -10.57014 
 1965 -10.70488 
 1966 -10.76082 
 1967 -10.77987 
 1968 -10.62107 
 1969 -10.48636 
 1970 -10.41656 
 1971 -10.52877 
 1972 -10.52743 
 1973 -10.46784 
 1974 -10.51171 
 1975 -10.17481 
 1976 -10.37647 
 1977 -10.45617 
 1978 -9.994697 
 1979 -10.18289 
 1980 -10.47311 
 1981 -10.02279 
 1982   -10.26 
 1983 -10.30867 
 1984 -10.41016 
 1985 -10.72627 
 1986 -10.03494 
 1987 -10.30993 
 1988 -10.04922 
 1989 -10.17293 
 1990 -10.12778 
 1991 -10.02146 
 1992 -10.15307 
 1993 -10.90133 
 1994 -10.02543 
 1995 -10.72572 
 1996 -9.95117 
 1997 -9.691251 
 1998 -9.385943 
 1999 -10.23375 
 2000 -9.936114 
 2001 -9.853162 
 2002 -10.09031 
 2003 -9.429813 
 2004 -9.821938 
 2005 -9.372614