# year    value 
 1940 -0.5630125 
 1941 -0.535079 
 1942 -0.5477505 
 1943 -0.5385647 
 1944 -0.5064835 
 1945 -0.5240884 
 1946 -0.5758757 
 1947 -0.5284303 
 1948 -0.5014096 
 1949 -0.4771352 
 1950 -0.4972867 
 1951 -0.5062084 
 1952 -0.5256989 
 1953 -0.5066534 
 1954 -0.5297946 
 1955 -0.5180472 
 1956 -0.5048767 
 1957 -0.4961665 
 1958 -0.5195712 
 1959 -0.4938127 
 1960 -0.4823156 
 1961 -0.4975658 
 1962 -0.5242782 
 1963 -0.621854 
 1964 -0.7700201 
 1965 -0.7201105 
 1966 -0.6710194 
 1967 -0.6434817 
 1968 -0.6620632 
 1969 -0.669325 
 1970 -0.6039298 
 1971 -0.5195904 
 1972 -0.4860193 
 1973 -0.4836268 
 1974 -0.4905368 
 1975 -0.4983706 
 1976 -0.466193 
 1977 -0.4480774 
 1978 -0.3741088 
 1979 -0.3215525 
 1980 -0.2721413 
 1981 -0.2210186 
 1982 -0.3752078 
 1983 -0.5344193 
 1984 -0.3834748 
 1985 -0.3381276 
 1986 -0.3201811 
 1987 -0.2221329 
 1988 -0.1416405 
 1989 -0.1049127 
 1990 -0.03853033 
 1991 -0.1238959 
 1992 -0.4407621 
 1993 -0.3099133 
 1994 -0.204577 
 1995 -0.1373034 
 1996 -0.04030006 
 1997 0.05203345 
 1998 0.0980532 
 1999 0.1245295 
 2000 0.1927276 
 2001 0.2725196 
 2002 0.3117502 
 2003 0.3135241 
 2004 0.3164704 
 2005 0.9142831