# year    value 
 1900 -11.48364 
 1901 -11.55807 
 1902 -11.48594 
 1903 -11.82389 
 1904 -12.14156 
 1905 -11.6467 
 1906 -11.78391 
 1907 -11.54963 
 1908 -11.38121 
 1909 -11.65148 
 1910 -11.75451 
 1911 -12.14232 
 1912 -11.62051 
 1913 -11.75338 
 1914 -11.70918 
 1915 -11.4884 
 1916 -11.91602 
 1917 -11.84362 
 1918 -11.48116 
 1919 -11.55272 
 1920 -11.71441 
 1921 -11.15349 
 1922 -11.31885 
 1923 -11.3751 
 1924 -12.01821 
 1925 -11.43249 
 1926 -11.33979 
 1927 -11.64775 
 1928 -11.50683 
 1929 -11.39665 
 1930 -11.73302 
 1931 -11.40756 
 1932 -11.30908 
 1933 -11.75249 
 1934 -11.55401 
 1935 -11.45454 
 1936 -11.6124 
 1937 -11.63851 
 1938 -11.15022 
 1939 -11.63108 
 1940 -11.58053 
 1941 -11.2338 
 1942 -11.37243 
 1943 -11.35885 
 1944 -11.58064 
 1945 -11.53505 
 1946 -11.78626 
 1947 -11.54923 
 1948 -11.70182 
 1949 -11.45567 
 1950 -11.51189 
 1951 -11.09978 
 1952 -11.48091 
 1953 -11.05807 
 1954 -11.42099 
 1955 -11.68435 
 1956 -11.65787 
 1957 -11.5232 
 1958 -11.52344 
 1959 -11.32264 
 1960 -11.39191 
 1961 -11.24105 
 1962 -11.41158 
 1963 -11.50089 
 1964 -11.60639 
 1965 -11.79762 
 1966 -11.60418 
 1967 -11.70946 
 1968 -11.51734 
 1969 -11.6586 
 1970 -11.62356 
 1971 -11.61081 
 1972 -11.46798 
 1973  -11.511 
 1974 -11.73238 
 1975 -11.47269 
 1976 -11.46183 
 1977 -11.67548 
 1978 -11.16995 
 1979 -11.09896 
 1980 -11.56583 
 1981 -11.18547 
 1982 -11.2682 
 1983 -11.6384 
 1984 -11.46785 
 1985 -11.76229 
 1986 -11.25657 
 1987 -11.26753 
 1988 -11.31482 
 1989 -11.26426 
 1990 -11.21592 
 1991 -10.97537 
 1992 -11.27824 
 1993 -11.8432 
 1994 -11.08791 
 1995 -11.39551 
 1996 -11.1417 
 1997 -10.8622 
 1998 -10.48671 
 1999 -11.04114 
 2000 -10.73886 
 2001 -11.0735 
 2002 -11.07562 
 2003 -10.46163 
 2004 -10.95953 
 2005 -10.57301