# year    value 
 1900 -12.07052 
 1901 -12.02905 
 1902 -11.92366 
 1903 -12.40705 
 1904 -12.33113 
 1905 -12.17141 
 1906 -12.08858 
 1907 -11.98384 
 1908 -12.04852 
 1909 -12.08955 
 1910 -11.98801 
 1911 -11.81259 
 1912 -11.91064 
 1913 -12.18198 
 1914 -12.10967 
 1915 -12.04917 
 1916 -11.84995 
 1917 -11.84995 
 1918 -11.98054 
 1919 -12.04924 
 1920 -11.93519 
 1921 -11.96945 
 1922 -11.87037 
 1923 -11.89968 
 1924 -11.81043 
 1925 -11.82703 
 1926 -11.74495 
 1927 -11.86845 
 1928 -11.74477 
 1929 -11.93198 
 1930 -11.87248 
 1931 -11.73654 
 1932 -11.99059 
 1933 -11.86388 
 1934 -11.7059 
 1935 -11.85066 
 1936 -11.73369 
 1937 -11.83868 
 1938 -11.77085 
 1939 -11.8196 
 1940 -11.77728 
 1941 -11.79183 
 1942 -11.74455 
 1943 -11.6732 
 1944 -11.66669 
 1945 -11.68871 
 1946 -11.7578 
 1947 -11.66497 
 1948 -11.75186 
 1949 -11.88262 
 1950 -11.72425 
 1951 -11.88121 
 1952 -11.94903 
 1953 -11.63372 
 1954 -11.81914 
 1955 -11.57366 
 1956 -11.76135 
 1957 -11.87336 
 1958 -11.84703 
 1959 -11.79044 
 1960 -11.86224 
 1961 -11.74874 
 1962 -11.65737 
 1963 -11.71007 
 1964 -12.03585 
 1965 -12.01719 
 1966 -11.86975 
 1967 -11.99046 
 1968 -11.93969 
 1969 -12.13621 
 1970 -11.94329 
 1971 -11.75398 
 1972 -11.79025 
 1973 -11.79351 
 1974 -11.53926 
 1975 -11.85139 
 1976 -11.77076 
 1977 -11.65546 
 1978 -11.65796 
 1979 -11.71576 
 1980 -11.60681 
 1981 -11.39583 
 1982 -11.4597 
 1983 -12.07756 
 1984 -11.57345 
 1985 -11.71647 
 1986 -11.58752 
 1987 -11.47893 
 1988 -11.40348 
 1989 -11.51709 
 1990 -11.2692 
 1991 -11.2044 
 1992 -11.81469 
 1993 -11.6814 
 1994 -11.7476 
 1995 -11.26439 
 1996 -11.15126 
 1997 -11.32294 
 1998 -11.34625 
 1999 -11.31763 
 2000  -10.925 
 2001 -11.00771 
 2002 -10.95279 
 2003 -10.87748 
 2004 -10.93008 
 2005 -10.97526