# year    value 
 1900 -17.89164 
 1901 -16.98067 
 1902 -17.16092 
 1903 -17.2784 
 1904 -17.58293 
 1905 -17.69797 
 1906 -17.51896 
 1907 -17.52233 
 1908 -17.52396 
 1909 -17.43744 
 1910 -17.64205 
 1911 -17.29212 
 1912 -17.40811 
 1913 -17.51984 
 1914 -17.70308 
 1915 -17.51773 
 1916 -17.32557 
 1917 -17.42871 
 1918 -17.04818 
 1919 -17.18665 
 1920 -16.95937 
 1921 -17.35012 
 1922 -17.03721 
 1923 -16.81474 
 1924 -17.07329 
 1925 -16.93532 
 1926 -16.89368 
 1927 -16.82833 
 1928 -17.14515 
 1929 -17.01988 
 1930 -17.01535 
 1931 -17.09731 
 1932 -17.01766 
 1933 -16.98842 
 1934 -17.12317 
 1935 -17.05368 
 1936 -17.03924 
 1937 -16.93819 
 1938 -17.04896 
 1939 -16.76925 
 1940 -16.94899 
 1941 -17.03298 
 1942 -17.05604 
 1943 -16.81491 
 1944 -16.86725 
 1945 -16.83202 
 1946 -16.75598 
 1947 -16.99164 
 1948 -16.62111 
 1949 -16.7335 
 1950 -16.79036 
 1951 -16.77286 
 1952 -16.72273 
 1953 -16.67557 
 1954 -16.85919 
 1955 -16.84237 
 1956 -16.8503 
 1957 -16.71112 
 1958 -16.76453 
 1959 -16.62871 
 1960 -16.64452 
 1961 -16.73856 
 1962 -16.64121 
 1963 -16.73361 
 1964 -16.70157 
 1965 -17.02362 
 1966 -16.75157 
 1967 -17.04981 
 1968 -16.9252 
 1969 -16.74269 
 1970 -16.67513 
 1971 -16.9976 
 1972 -16.68398 
 1973 -16.49868 
 1974 -16.56912 
 1975 -16.5544 
 1976 -16.72728 
 1977 -16.5939 
 1978 -16.45264 
 1979 -16.27766 
 1980 -16.27672 
 1981 -16.15698 
 1982 -16.1361 
 1983 -16.35773 
 1984 -16.47154 
 1985 -16.26357 
 1986 -16.09244 
 1987 -15.95099 
 1988 -15.87598 
 1989 -15.93039 
 1990 -15.79065 
 1991 -15.78213 
 1992 -15.85027 
 1993 -15.86704 
 1994 -15.92226 
 1995 -16.18587 
 1996 -15.85476 
 1997  -15.599 
 1998 -15.39589 
 1999 -15.48803 
 2000 -15.43113 
 2001 -15.01418 
 2002 -15.04776 
 2003 -14.71841 
 2004 -14.75497 
 2005 -14.47815