# year    value 
 1900 -12.16538 
 1901 -12.09822 
 1902 -11.99958 
 1903 -12.50933 
 1904 -12.37623 
 1905 -12.22799 
 1906 -12.10524 
 1907 -12.04932 
 1908 -12.12399 
 1909 -12.14245 
 1910 -12.01929 
 1911 -11.88226 
 1912 -12.03282 
 1913 -12.25885 
 1914 -12.13519 
 1915 -12.11562 
 1916 -11.9382 
 1917 -11.93584 
 1918 -12.04684 
 1919 -12.11154 
 1920 -12.04977 
 1921 -12.02611 
 1922 -11.86677 
 1923 -12.01655 
 1924 -11.87045 
 1925 -11.89001 
 1926 -11.85703 
 1927 -11.96853 
 1928 -11.79096 
 1929 -11.99296 
 1930 -11.89951 
 1931 -11.80159 
 1932 -12.00444 
 1933 -11.94169 
 1934 -11.75184 
 1935 -11.90148 
 1936 -11.79632 
 1937 -11.89565 
 1938 -11.85752 
 1939 -11.8851 
 1940 -11.82805 
 1941 -11.79604 
 1942 -11.8118 
 1943 -11.75201 
 1944 -11.67987 
 1945 -11.74126 
 1946 -11.79722 
 1947 -11.75491 
 1948 -11.8196 
 1949 -11.93681 
 1950 -11.80718 
 1951 -11.9728 
 1952 -12.03658 
 1953 -11.7265 
 1954 -11.89983 
 1955 -11.6506 
 1956 -11.78932 
 1957 -12.02108 
 1958 -11.9122 
 1959 -11.84064 
 1960 -11.91344 
 1961 -11.80727 
 1962 -11.68701 
 1963 -11.80486 
 1964 -12.12293 
 1965 -12.06126 
 1966 -11.92041 
 1967 -12.05111 
 1968 -12.01784 
 1969 -12.17947 
 1970 -11.98674 
 1971 -11.74591 
 1972 -11.89332 
 1973 -11.85188 
 1974 -11.57107 
 1975 -11.96262 
 1976 -11.83509 
 1977 -11.68638 
 1978 -11.67066 
 1979 -11.78434 
 1980 -11.64377 
 1981 -11.37697 
 1982 -11.50942 
 1983 -12.12831 
 1984 -11.57922 
 1985 -11.76695 
 1986 -11.67559 
 1987 -11.45458 
 1988 -11.47111 
 1989 -11.5396 
 1990 -11.2769 
 1991 -11.27106 
 1992 -11.92237 
 1993 -11.70469 
 1994 -11.83457 
 1995 -11.32227 
 1996 -11.23274 
 1997 -11.39687 
 1998 -11.40034 
 1999 -11.38859 
 2000 -10.98245 
 2001 -11.06436 
 2002 -11.01427 
 2003 -10.93884 
 2004 -10.95821 
 2005 -11.03708