# year    value 
 1900 1.113214 
 1901 1.011171 
 1902 1.018828 
 1903 0.8304397 
 1904 0.8254882 
 1905 0.9364338 
 1906 0.9347785 
 1907 0.9844425 
 1908 0.9856359 
 1909 1.040523 
 1910 1.019639 
 1911 1.079799 
 1912 1.083775 
 1913 1.065899 
 1914  1.03171 
 1915 1.080857 
 1916 1.112835 
 1917 1.148172 
 1918 1.073385 
 1919 1.067998 
 1920 1.123501 
 1921 1.213765 
 1922  1.13425 
 1923 1.175376 
 1924 1.169773 
 1925 1.192191 
 1926 1.114475 
 1927 1.192316 
 1928 1.203274 
 1929 1.123435 
 1930 1.179795 
 1931 1.128281 
 1932 1.174346 
 1933 1.148859 
 1934 1.048062 
 1935 1.158281 
 1936 1.228848 
 1937 1.280483 
 1938 1.245874 
 1939 1.265493 
 1940 1.232158 
 1941 1.198449 
 1942 1.292297 
 1943 1.256289 
 1944 1.292842 
 1945 1.298081 
 1946 1.224641 
 1947 1.221516 
 1948 1.286027 
 1949 1.363322 
 1950 1.253664 
 1951 1.291055 
 1952 1.283638 
 1953 1.230416 
 1954 1.304577 
 1955 1.231803 
 1956 1.328782 
 1957 1.359493 
 1958 1.281145 
 1959  1.29218 
 1960 1.323765 
 1961 1.353798 
 1962 1.298448 
 1963 1.264542 
 1964 0.9636598 
 1965 1.072573 
 1966 1.141232 
 1967  1.12417 
 1968 1.165357 
 1969  1.17205 
 1970 1.246036 
 1971 1.301969 
 1972 1.299084 
 1973 1.346882 
 1974 1.299545 
 1975 1.328071 
 1976 1.346949 
 1977 1.343018 
 1978 1.307814 
 1979 1.410908 
 1980 1.495429 
 1981 1.533467 
 1982 1.466066 
 1983 1.260988 
 1984  1.40753 
 1985 1.416035 
 1986 1.370158 
 1987 1.487472 
 1988 1.611382 
 1989 1.527596 
 1990 1.653998 
 1991 1.681745 
 1992    1.314 
 1993 1.431515 
 1994 1.388452 
 1995 1.432148 
 1996 1.620695 
 1997 1.687158 
 1998  1.74811 
 1999  1.72046 
 2000 1.742902 
 2001 1.790676 
 2002 1.949931 
 2003 1.851934 
 2004 1.838852 
 2005 1.932359