# year    value 
 1960 -0.3727011 
 1961 -0.3452105 
 1962 -0.3962284 
 1963 -0.4485793 
 1964 -0.6294339 
 1965 -0.5110248 
 1966 -0.5112261 
 1967 -0.4271432 
 1968 -0.4029762 
 1969 -0.4336502 
 1970 -0.4050015 
 1971 -0.3089363 
 1972 -0.2575179 
 1973 -0.2888155 
 1974 -0.3173726 
 1975 -0.3311715 
 1976 -0.3514019 
 1977 -0.2282254 
 1978 -0.279792 
 1979 -0.1592867 
 1980 -0.1826773 
 1981 -0.1307039 
 1982 -0.2245335 
 1983 -0.3303723 
 1984 -0.2165764 
 1985 -0.1635664 
 1986 -0.2110096 
 1987 -0.1710151 
 1988 -0.08465114 
 1989 -0.02870012 
 1990 -0.02958902 
 1991 -0.07212226 
 1992 -0.2951371 
 1993 -0.1955327 
 1994 -0.1457232 
 1995 -0.07991126 
 1996 -0.03741666 
 1997 0.04550819 
 1998 0.0967144 
 1999 0.1069541 
 2000 0.09216728 
 2001 0.1923958 
 2002 0.2353736 
 2003 0.1974265 
 2004 0.1680212 
 2005 -0.1588946