# year    value 
 1900 1.781044 
 1901 1.454934 
 1902 1.486701 
 1903 1.310407 
 1904 1.343201 
 1905 1.422773 
 1906 1.564826 
 1907 1.455457 
 1908 1.625369 
 1909 1.534891 
 1910  1.58481 
 1911 1.606664 
 1912 1.616598 
 1913 1.568462 
 1914 1.631658 
 1915 1.548871 
 1916 1.709569 
 1917 1.659942 
 1918 1.601178 
 1919 1.621436 
 1920 1.692904 
 1921 1.784416 
 1922 1.659225 
 1923 1.706785 
 1924 1.707232 
 1925 1.747164 
 1926 1.686521 
 1927 1.761992 
 1928  1.81343 
 1929 1.727012 
 1930 1.737035 
 1931  1.68345 
 1932 1.685773 
 1933 1.644038 
 1934 1.588355 
 1935 1.674563 
 1936 1.733914 
 1937 1.803465 
 1938 1.775744 
 1939  1.79365 
 1940 1.820621 
 1941  1.77201 
 1942 1.841819 
 1943 1.756836 
 1944 1.835103 
 1945 1.751568 
 1946 1.707485 
 1947 1.774554 
 1948 1.797445 
 1949 1.898085 
 1950 1.779705 
 1951 1.827789 
 1952 1.801191 
 1953 1.768696 
 1954 1.857313 
 1955 1.809569 
 1956   1.8094 
 1957 1.920918 
 1958 1.797241 
 1959  1.82596 
 1960  1.90439 
 1961 1.863259 
 1962 1.883708 
 1963 1.823355 
 1964 1.407735 
 1965 1.576424 
 1966  1.58816 
 1967 1.619562 
 1968 1.721879 
 1969 1.631049 
 1970 1.717197 
 1971 1.906618 
 1972 1.887886 
 1973 1.811567 
 1974 1.845392 
 1975 1.911792 
 1976 1.933604 
 1977 1.936455 
 1978  1.87346 
 1979 1.921283 
 1980 2.056179 
 1981 2.131853 
 1982   2.0094 
 1983 1.854475 
 1984 1.938762 
 1985  1.94074 
 1986 1.921817 
 1987 2.080022 
 1988 2.167911 
 1989 2.047541 
 1990 2.218099 
 1991 2.090847 
 1992 1.865459 
 1993 1.976057 
 1994 1.879015 
 1995 2.025283 
 1996 2.153193 
 1997 2.253777 
 1998 2.255578 
 1999 2.266525 
 2000 2.343785 
 2001 2.314504 
 2002 2.480673 
 2003 2.357249 
 2004 2.392168 
 2005 2.507164