# year    value 
 1900 -13.30723 
 1901 -12.81038 
 1902 -12.73827 
 1903 -13.03033 
 1904 -13.02291 
 1905 -12.96904 
 1906 -12.93679 
 1907 -12.86053 
 1908 -12.93503 
 1909 -12.92152 
 1910   -12.84 
 1911 -12.86344 
 1912 -12.78331 
 1913 -13.04392 
 1914 -13.00342 
 1915 -12.96581 
 1916 -12.9409 
 1917 -12.85073 
 1918 -12.8343 
 1919 -12.68839 
 1920 -12.85147 
 1921 -12.63186 
 1922 -12.51184 
 1923 -12.77315 
 1924 -12.73845 
 1925 -12.74852 
 1926 -12.57606 
 1927 -12.70389 
 1928 -12.52243 
 1929 -12.67779 
 1930 -12.57607 
 1931 -12.65215 
 1932 -12.51713 
 1933 -12.78002 
 1934 -12.64313 
 1935    -12.7 
 1936 -12.55854 
 1937 -12.65224 
 1938 -12.46358 
 1939 -12.6915 
 1940 -12.59711 
 1941 -12.54397 
 1942 -12.57783 
 1943 -12.53627 
 1944 -12.56737 
 1945 -12.5275 
 1946 -12.76495 
 1947 -12.6405 
 1948 -12.65016 
 1949 -12.51268 
 1950 -12.55161 
 1951 -12.5998 
 1952 -12.67729 
 1953 -12.48251 
 1954 -12.62423 
 1955 -12.48228 
 1956 -12.57788 
 1957 -12.52864 
 1958 -12.59023 
 1959 -12.52205 
 1960 -12.61441 
 1961 -12.45021 
 1962 -12.56538 
 1963 -12.63612 
 1964 -12.8072 
 1965 -12.82766 
 1966 -12.75568 
 1967 -12.88067 
 1968 -12.7406 
 1969 -12.82193 
 1970 -12.74341 
 1971 -12.70181 
 1972 -12.61896 
 1973 -12.54906 
 1974 -12.45626 
 1975 -12.58936 
 1976 -12.63519 
 1977 -12.54802 
 1978 -12.34654 
 1979 -12.31038 
 1980 -12.34679 
 1981 -12.11272 
 1982 -12.1283 
 1983 -12.57912 
 1984 -12.39526 
 1985 -12.54643 
 1986 -12.35786 
 1987 -12.15705 
 1988 -12.19553 
 1989 -12.10628 
 1990 -11.85247 
 1991 -11.86458 
 1992 -12.29497 
 1993 -12.29973 
 1994 -12.25859 
 1995 -12.00133 
 1996 -11.94504 
 1997 -12.0128 
 1998 -11.7679 
 1999 -11.99016 
 2000 -11.72365 
 2001 -11.64518 
 2002 -11.58111 
 2003 -11.35218 
 2004 -11.40946 
 2005 -11.43355