# year value 1900 -1.652854 1901 -1.69881 1902 -1.87487 1903 -2.045703 1904 -2.271433 1905 -1.844741 1906 -1.844038 1907 -1.626491 1908 -1.597964 1909 -1.716592 1910 -1.792711 1911 -2.082251 1912 -1.837334 1913 -1.962426 1914 -1.888687 1915 -1.747989 1916 -1.98605 1917 -1.725084 1918 -1.57768 1919 -1.506881 1920 -1.697153 1921 -1.570257 1922 -1.694102 1923 -1.63614 1924 -1.944986 1925 -1.804354 1926 -1.645525 1927 -1.464396 1928 -1.595935 1929 -1.683745 1930 -1.770363 1931 -1.805528 1932 -1.533266 1933 -1.718185 1934 -1.777904 1935 -1.658826 1936 -1.583323 1937 -1.628832 1938 -1.626127 1939 -1.540282 1940 -1.668102 1941 -1.395455 1942 -1.572123 1943 -1.765855 1944 -1.453722 1945 -1.544134 1946 -1.536834 1947 -1.62863 1948 -1.545979 1949 -1.550306 1950 -1.581531 1951 -1.526907 1952 -1.410907 1953 -1.543654 1954 -1.66163 1955 -1.778781 1956 -1.611208 1957 -1.749866 1958 -1.573623 1959 -1.63792 1960 -1.676634 1961 -1.514086 1962 -1.690904 1963 -1.584393 1964 -1.864999 1965 -1.78027 1966 -1.783666 1967 -1.59071 1968 -1.727548 1969 -1.773336 1970 -1.788792 1971 -1.575364 1972 -1.675521 1973 -1.591324 1974 -1.721755 1975 -1.746605 1976 -1.601635 1977 -1.583944 1978 -1.503763 1979 -1.381248 1980 -1.372144 1981 -1.46331 1982 -1.50029 1983 -1.821962 1984 -1.487145 1985 -1.59923 1986 -1.438184 1987 -1.604771 1988 -1.552184 1989 -1.230793 1990 -1.314238 1991 -1.243766 1992 -1.590792 1993 -1.528323 1994 -1.097257 1995 -1.303146 1996 -1.361526 1997 -1.261746 1998 -1.056651 1999 -1.18422 2000 -0.7843969 2001 -0.8707947 2002 -1.079226 2003 -0.8034955 2004 -0.7847494 2005 -0.876884