# year value 1900 -1.387663 1901 -1.341037 1902 -1.409377 1903 -1.543025 1904 -1.541277 1905 -1.513854 1906 -1.406608 1907 -1.409891 1908 -1.318661 1909 -1.361102 1910 -1.324513 1911 -1.31354 1912 -1.241591 1913 -1.303676 1914 -1.344242 1915 -1.308676 1916 -1.282899 1917 -1.303628 1918 -1.294489 1919 -1.281506 1920 -1.259716 1921 -1.280928 1922 -1.289901 1923 -1.32003 1924 -1.287097 1925 -1.25548 1926 -1.292109 1927 -1.306746 1928 -1.253802 1929 -1.248627 1930 -1.217472 1931 -1.29181 1932 -1.211064 1933 -1.211683 1934 -1.277957 1935 -1.240142 1936 -1.23381 1937 -1.190737 1938 -1.242325 1939 -1.219384 1940 -1.209696 1941 -1.221689 1942 -1.185247 1943 -1.274732 1944 -1.18391 1945 -1.211295 1946 -1.173861 1947 -1.168027 1948 -1.154825 1949 -1.15609 1950 -1.214498 1951 -1.193119 1952 -1.203482 1953 -1.126936 1954 -1.153651 1955 -1.196661 1956 -1.177866 1957 -1.150703 1958 -1.170973 1959 -1.062476 1960 -1.144339 1961 -1.148344 1962 -1.126858 1963 -1.292487 1964 -1.36845 1965 -1.277968 1966 -1.249098 1967 -1.212443 1968 -1.185601 1969 -1.209383 1970 -1.142051 1971 -1.112048 1972 -1.089463 1973 -1.121682 1974 -1.156048 1975 -1.132283 1976 -1.187596 1977 -1.05899 1978 -1.069324 1979 -0.9734643 1980 -0.9717867 1981 -0.9332358 1982 -1.040747 1983 -1.115699 1984 -0.9766185 1985 -0.9961115 1986 -1.019443 1987 -0.9758829 1988 -0.8775935 1989 -0.8044501 1990 -0.8246854 1991 -0.9833283 1992 -1.076313 1993 -0.9807371 1994 -0.9014145 1995 -0.8698052 1996 -0.8178389 1997 -0.7655295 1998 -0.7582867 1999 -0.7614942 2000 -0.6730313 2001 -0.6643853 2002 -0.6441904 2003 -0.6377808 2004 -0.6401072 2005 -0.5872306