# year    value 
 1900 -17.83749 
 1901 -16.86111 
 1902 -17.0125 
 1903 -17.10556 
 1904 -17.46103 
 1905 -17.54134 
 1906 -17.40047 
 1907 -17.38616 
 1908 -17.42946 
 1909 -17.33053 
 1910 -17.5549 
 1911 -17.18083 
 1912 -17.27932 
 1913 -17.43142 
 1914 -17.56281 
 1915 -17.40202 
 1916 -17.24286 
 1917 -17.31401 
 1918 -16.92055 
 1919 -17.07086 
 1920 -16.85712 
 1921 -17.22463 
 1922 -16.8785 
 1923 -16.6802 
 1924 -16.97383 
 1925 -16.84638 
 1926 -16.78815 
 1927 -16.71966 
 1928 -17.03029 
 1929 -16.86931 
 1930 -16.88358 
 1931 -16.97688 
 1932 -16.87806 
 1933 -16.85781 
 1934 -16.98535 
 1935 -16.91809 
 1936 -16.91388 
 1937 -16.78731 
 1938 -16.91157 
 1939 -16.6546 
 1940 -16.81848 
 1941 -16.92578 
 1942 -16.94917 
 1943 -16.6807 
 1944 -16.76678 
 1945  -16.685 
 1946 -16.63046 
 1947 -16.85647 
 1948 -16.52573 
 1949 -16.61974 
 1950 -16.64884 
 1951 -16.63476 
 1952 -16.58858 
 1953 -16.52425 
 1954 -16.66581 
 1955 -16.6784 
 1956 -16.72631 
 1957 -16.56055 
 1958 -16.62414 
 1959 -16.47778 
 1960 -16.54928 
 1961 -16.58847 
 1962 -16.53324 
 1963 -16.63547 
 1964 -16.52476 
 1965 -16.85478 
 1966 -16.64186 
 1967 -16.94213 
 1968 -16.76924 
 1969 -16.60549 
 1970 -16.5662 
 1971 -16.88349 
 1972 -16.53878 
 1973 -16.37142 
 1974 -16.44464 
 1975 -16.43183 
 1976 -16.60624 
 1977 -16.49854 
 1978 -16.32983 
 1979 -16.14217 
 1980 -16.12355 
 1981 -15.99277 
 1982 -15.95539 
 1983  -16.219 
 1984 -16.37039 
 1985 -16.10435 
 1986 -15.94777 
 1987 -15.77085 
 1988 -15.72521 
 1989 -15.7913 
 1990 -15.64256 
 1991 -15.64665 
 1992 -15.70132 
 1993 -15.75209 
 1994 -15.73719 
 1995 -16.0259 
 1996 -15.71197 
 1997 -15.46803 
 1998 -15.22452 
 1999 -15.30819 
 2000 -15.27407 
 2001 -14.86652 
 2002 -14.85874 
 2003 -14.54839 
 2004 -14.57813 
 2005 -14.29843