# year    value 
 1900 -3.358088 
 1901 -3.380589 
 1902 -3.432234 
 1903 -3.549442 
 1904 -3.495202 
 1905 -3.385451 
 1906 -3.370238 
 1907 -3.313297 
 1908 -3.351042 
 1909 -3.400581 
 1910 -3.384507 
 1911 -3.384176 
 1912 -3.22493 
 1913 -3.449319 
 1914 -3.359067 
 1915 -3.262383 
 1916 -3.254268 
 1917 -3.25989 
 1918 -3.152107 
 1919 -3.227427 
 1920 -3.18509 
 1921 -3.11251 
 1922 -3.222455 
 1923 -3.267258 
 1924 -3.189294 
 1925 -3.172229 
 1926 -3.193866 
 1927 -3.090507 
 1928 -3.008061 
 1929 -3.110996 
 1930 -3.306419 
 1931 -3.180247 
 1932 -3.14602 
 1933 -3.173565 
 1934 -3.276851 
 1935 -3.090891 
 1936 -3.118239 
 1937 -3.064046 
 1938 -3.066177 
 1939 -3.057071 
 1940 -3.065412 
 1941 -3.028901 
 1942 -3.075545 
 1943 -3.077917 
 1944 -3.119912 
 1945 -2.894314 
 1946  -3.0334 
 1947 -3.107693 
 1948 -3.03105 
 1949 -3.000035 
 1950 -3.15153 
 1951 -3.059354 
 1952 -3.19337 
 1953 -3.022592 
 1954 -3.105585 
 1955 -3.103276 
 1956 -3.065221 
 1957 -3.057045 
 1958 -3.062667 
 1959 -3.067478 
 1960 -3.019889 
 1961 -3.126183 
 1962 -3.166366 
 1963 -3.358779 
 1964 -3.337135 
 1965 -3.24188 
 1966 -3.134115 
 1967 -3.213474 
 1968 -3.246967 
 1969 -3.180723 
 1970 -3.203908 
 1971 -3.140759 
 1972 -3.024479 
 1973 -3.098654 
 1974 -3.081532 
 1975 -3.146776 
 1976 -2.922901 
 1977 -2.868759 
 1978 -2.949694 
 1979 -2.883215 
 1980 -2.802594 
 1981 -2.940897 
 1982 -2.927867 
 1983 -3.025877 
 1984 -2.955786 
 1985 -3.052317 
 1986 -2.946046 
 1987 -2.744086 
 1988 -2.794694 
 1989 -2.74492 
 1990 -2.636256 
 1991 -2.828078 
 1992 -3.063514 
 1993 -2.872713 
 1994 -2.90519 
 1995 -2.862349 
 1996 -2.540637 
 1997 -2.659895 
 1998 -2.415237 
 1999 -2.48621 
 2000 -2.546378 
 2001 -2.443115 
 2002 -2.29746 
 2003 -2.496686 
 2004 -2.31793 
 2005 -2.366117