# year value 1900 -1.223701 1901 -1.193995 1902 -1.268273 1903 -1.461293 1904 -1.41916 1905 -1.403192 1906 -1.29178 1907 -1.327239 1908 -1.154825 1909 -1.170963 1910 -1.213031 1911 -1.167595 1912 -1.079863 1913 -1.106709 1914 -1.177518 1915 -1.172411 1916 -1.093903 1917 -1.119406 1918 -1.168971 1919 -1.154959 1920 -1.10272 1921 -1.09093 1922 -1.141533 1923 -1.182336 1924 -1.117128 1925 -1.061805 1926 -1.075279 1927 -1.153509 1928 -1.07031 1929 -1.104846 1930 -1.039016 1931 -1.134693 1932 -1.047819 1933 -1.076147 1934 -1.116534 1935 -1.074441 1936 -1.077582 1937 -1.009182 1938 -1.1438 1939 -1.065913 1940 -1.086373 1941 -1.047132 1942 -0.9429992 1943 -1.125864 1944 -0.9379048 1945 -1.015108 1946 -1.003302 1947 -0.9601844 1948 -0.9995399 1949 -1.026692 1950 -1.039036 1951 -1.076263 1952 -1.050642 1953 -0.9556141 1954 -0.9968057 1955 -1.06877 1956 -1.01954 1957 -0.9991623 1958 -0.9961748 1959 -0.9112256 1960 -0.9704061 1961 -0.9940845 1962 -0.9101113 1963 -1.08001 1964 -1.220378 1965 -1.092475 1966 -1.111664 1967 -1.083231 1968 -1.008182 1969 -1.031591 1970 -0.9721391 1971 -0.9157358 1972 -0.8833115 1973 -0.922174 1974 -0.9660318 1975 -0.9792916 1976 -1.041786 1977 -0.865899 1978 -0.9299392 1979 -0.7137453 1980 -0.8062963 1981 -0.7069201 1982 -0.8092412 1983 -0.9658835 1984 -0.7736664 1985 -0.7479613 1986 -0.8277577 1987 -0.8153892 1988 -0.6444357 1989 -0.5752133 1990 -0.6292096 1991 -0.7540521 1992 -0.8992056 1993 -0.7367572 1994 -0.6933979 1995 -0.6043137 1996 -0.6243076 1997 -0.5271711 1998 -0.526269 1999 -0.5464225 2000 -0.4303192 2001 -0.4417603 2002 -0.3741094 2003 -0.4380319 2004 -0.3844965 2005 -0.3833497