# year    value 
 1900 1.105119 
 1901  1.01702 
 1902 1.000652 
 1903 0.8311368 
 1904 0.8058695 
 1905 0.925163 
 1906 0.8911787 
 1907 0.9828197 
 1908 0.9513145 
 1909 1.032753 
 1910 0.9601428 
 1911 1.094748 
 1912 1.028573 
 1913 1.011822 
 1914 1.030805 
 1915 1.043318 
 1916 1.099809 
 1917 1.091329 
 1918 1.057847 
 1919  1.06292 
 1920 1.108048 
 1921 1.166459 
 1922 1.139209 
 1923 1.195799 
 1924  1.13112 
 1925 1.143787 
 1926 1.093034 
 1927 1.209705 
 1928  1.18078 
 1929 1.139451 
 1930 1.159379 
 1931 1.132309 
 1932 1.178837 
 1933 1.161266 
 1934 1.042105 
 1935 1.135244 
 1936 1.231215 
 1937 1.260726 
 1938 1.248319 
 1939 1.209242 
 1940 1.245612 
 1941 1.204177 
 1942 1.267788 
 1943  1.24596 
 1944  1.28948 
 1945   1.2656 
 1946 1.208937 
 1947 1.228888 
 1948 1.212492 
 1949 1.329765 
 1950  1.23114 
 1951 1.256203 
 1952 1.258932 
 1953 1.205376 
 1954 1.281525 
 1955 1.249449 
 1956 1.281654 
 1957  1.34537 
 1958 1.254688 
 1959 1.324668 
 1960 1.355805 
 1961 1.339025 
 1962 1.273394 
 1963 1.265812 
 1964 0.9532383 
 1965 1.017693 
 1966 1.103752 
 1967 1.065888 
 1968  1.18287 
 1969 1.155432 
 1970 1.212813 
 1971 1.266347 
 1972  1.32246 
 1973 1.334313 
 1974  1.29799 
 1975 1.304636 
 1976 1.311225 
 1977 1.275666 
 1978 1.342459 
 1979 1.399188 
 1980 1.488119 
 1981 1.538713 
 1982 1.508672 
 1983 1.270505 
 1984 1.403784 
 1985 1.388627 
 1986 1.389571 
 1987 1.518976 
 1988 1.637407 
 1989 1.548418 
 1990  1.67858 
 1991 1.676716 
 1992 1.333988 
 1993 1.440951 
 1994 1.397297 
 1995  1.47872 
 1996 1.651652 
 1997 1.700151 
 1998 1.732127 
 1999 1.761506 
 2000 1.837583 
 2001 1.840481 
 2002  1.99447 
 2003 1.925062 
 2004 1.861357 
 2005 2.015064