# year    value 
 1900 0.1378369 
 1901 0.05619977 
 1902 -0.04908242 
 1903 -0.1850094 
 1904 -0.04812175 
 1905 -0.03301327 
 1906 0.1174908 
 1907 0.03120779 
 1908 0.05414884 
 1909 0.02738464 
 1910 0.08352631 
 1911 0.1479759 
 1912 0.1355902 
 1913 0.06484111 
 1914 0.08607271 
 1915 0.1668438 
 1916 0.1759159 
 1917 0.1155931 
 1918 0.1934428 
 1919 0.1886021 
 1920 0.2338748 
 1921 0.1800852 
 1922 0.276022 
 1923 0.1740547 
 1924 0.2423602 
 1925 0.1998273 
 1926 0.2512177 
 1927 0.2696257 
 1928 0.2838935 
 1929 0.2342522 
 1930 0.1896804 
 1931 0.2443077 
 1932 0.2425719 
 1933 0.1555961 
 1934 0.1522671 
 1935 0.3207527 
 1936 0.3223229 
 1937 0.2928166 
 1938 0.354351 
 1939 0.3034085 
 1940 0.288061 
 1941 0.3271973 
 1942 0.3280421 
 1943 0.3721223 
 1944 0.3409721 
 1945 0.3068179 
 1946  0.33808 
 1947 0.2968622 
 1948 0.3762989 
 1949 0.3565783 
 1950 0.3162563 
 1951 0.3722477 
 1952 0.2770335 
 1953 0.3713346 
 1954 0.3425479 
 1955 0.3727145 
 1956 0.4440354 
 1957 0.3542453 
 1958 0.4312072 
 1959 0.4566907 
 1960 0.390164 
 1961 0.3500562 
 1962 0.3516429 
 1963 0.1124865 
 1964 -0.02162158 
 1965 0.1980726 
 1966 0.197494 
 1967 0.2146354 
 1968 0.2401117 
 1969 0.2208225 
 1970 0.3207279 
 1971 0.4152799 
 1972 0.3583302 
 1973 0.3900371 
 1974 0.3973248 
 1975 0.3948849 
 1976 0.4356833 
 1977 0.408874 
 1978 0.5163937 
 1979 0.5714179 
 1980 0.6636593 
 1981 0.5888888 
 1982  0.37473 
 1983 0.4107682 
 1984 0.5220118 
 1985 0.4898357 
 1986 0.5303283 
 1987 0.6424975 
 1988 0.6649311 
 1989 0.7890207 
 1990 0.8269562 
 1991 0.4369158 
 1992 0.4836637 
 1993 0.5308294 
 1994 0.6006992 
 1995 0.6791787 
 1996 0.7943777 
 1997 0.8704635 
 1998 0.8829668 
 1999 0.9017866 
 2000 0.9820709 
 2001  1.12695 
 2002 1.084597 
 2003 1.029987 
 2004 1.102962 
 2005 1.151415