# year    value 
 1900 1.923232 
 1901 1.624078 
 1902 1.648769 
 1903 1.468922 
 1904 1.484195 
 1905 1.577668 
 1906 1.690509 
 1907 1.623447 
 1908 1.761776 
 1909 1.693964 
 1910  1.72939 
 1911 1.763902 
 1912 1.760068 
 1913 1.723576 
 1914 1.777846 
 1915 1.717035 
 1916 1.859592 
 1917 1.804088 
 1918 1.766949 
 1919 1.763109 
 1920 1.835446 
 1921 1.916332 
 1922 1.818431 
 1923 1.865021 
 1924  1.86189 
 1925  1.89155 
 1926 1.830685 
 1927 1.913136 
 1928 1.959348 
 1929 1.887949 
 1930 1.893101 
 1931 1.835065 
 1932 1.858929 
 1933  1.81821 
 1934 1.749915 
 1935 1.838364 
 1936 1.893184 
 1937 1.966565 
 1938 1.938521 
 1939 1.948389 
 1940 1.983087 
 1941 1.930346 
 1942 2.000785 
 1943 1.934133 
 1944 1.994573 
 1945 1.924315 
 1946  1.88293 
 1947 1.933674 
 1948 1.938689 
 1949 2.058115 
 1950 1.943133 
 1951 1.997212 
 1952 1.963653 
 1953 1.922803 
 1954 2.007581 
 1955 1.964846 
 1956 1.972027 
 1957 2.082773 
 1958  1.95501 
 1959  2.00436 
 1960  2.06987 
 1961 2.030748 
 1962 2.028374 
 1963 1.989713 
 1964 1.582315 
 1965 1.726537 
 1966 1.752265 
 1967 1.782364 
 1968 1.882549 
 1969 1.807171 
 1970 1.883213 
 1971 2.056379 
 1972 2.050973 
 1973 1.980322 
 1974 2.004731 
 1975 2.057802 
 1976 2.082282 
 1977 2.079996 
 1978  2.05129 
 1979 2.093367 
 1980 2.206568 
 1981 2.298432 
 1982 2.190227 
 1983 2.009609 
 1984 2.109289 
 1985  2.11372 
 1986 2.099977 
 1987 2.238562 
 1988 2.346409 
 1989 2.222941 
 1990 2.396722 
 1991 2.277524 
 1992 2.034586 
 1993 2.151235 
 1994 2.067715 
 1995 2.195055 
 1996 2.335945 
 1997 2.431053 
 1998 2.447422 
 1999 2.454688 
 2000 2.533653 
 2001 2.514203 
 2002 2.667223 
 2003 2.561835 
 2004 2.582316 
 2005 2.707558