# year    value 
 1940 -0.5822275 
 1941 -0.5229482 
 1942 -0.5907815 
 1943 -0.6120343 
 1944 -0.5576017 
 1945 -0.5674643 
 1946 -0.6472382 
 1947 -0.5606861 
 1948 -0.5807679 
 1949 -0.5177756 
 1950 -0.5052309 
 1951 -0.547174 
 1952 -0.5873043 
 1953 -0.5177866 
 1954 -0.5789063 
 1955 -0.5269109 
 1956 -0.5589839 
 1957 -0.5303096 
 1958 -0.5770847 
 1959 -0.5620344 
 1960 -0.5322205 
 1961 -0.5543817 
 1962 -0.6097751 
 1963 -0.6810591 
 1964 -0.8079555 
 1965 -0.7978778 
 1966 -0.7574813 
 1967 -0.7211764 
 1968 -0.7701291 
 1969 -0.8496652 
 1970 -0.7217393 
 1971 -0.6536151 
 1972 -0.5617902 
 1973 -0.6060665 
 1974 -0.5859856 
 1975 -0.6013991 
 1976 -0.5758038 
 1977 -0.5407098 
 1978 -0.4174176 
 1979 -0.3619133 
 1980 -0.3607754 
 1981 -0.232531 
 1982 -0.392179 
 1983 -0.6543172 
 1984 -0.4592416 
 1985 -0.4133266 
 1986 -0.360372 
 1987 -0.2758192 
 1988 -0.2156994 
 1989 -0.108165 
 1990 -0.05804435 
 1991 -0.07881048 
 1992 -0.5631784 
 1993 -0.4093808 
 1994 -0.1594759 
 1995 -0.08226661 
 1996 -0.07458044 
 1997 0.06676061 
 1998 0.09040655 
 1999 0.122115 
 2000 0.2613786 
 2001 0.2812758 
 2002 0.3274159 
 2003 0.4092499 
 2004 0.3865188 
 2005 1.379735