# year    value 
 1960 -0.8856175 
 1961 -0.891253 
 1962 -0.8897398 
 1963 -0.9694655 
 1964 -1.059153 
 1965  -1.1277 
 1966 -1.063803 
 1967 -1.001068 
 1968 -1.070102 
 1969 -0.966867 
 1970 -0.9831509 
 1971 -0.940307 
 1972 -0.8261712 
 1973 -0.8428691 
 1974 -0.824114 
 1975 -0.826754 
 1976 -0.8575867 
 1977 -0.7953568 
 1978 -0.6481581 
 1979 -0.526924 
 1980 -0.5103925 
 1981 -0.4175662 
 1982 -0.6586904 
 1983 -0.8549109 
 1984 -0.688212 
 1985 -0.5428258 
 1986 -0.6126249 
 1987 -0.3378317 
 1988 -0.328464 
 1989 -0.3111608 
 1990 -0.1213462 
 1991 -0.1841052 
 1992 -0.4233435 
 1993 -0.3721136 
 1994 -0.3079291 
 1995 -0.2668089 
 1996 -0.1386181 
 1997 0.0371735 
 1998 0.1267124 
 1999 0.2329082 
 2000 0.2963007 
 2001 0.4321753 
 2002 0.4558565 
 2003 0.5196548 
 2004 0.529893 
 2005 1.959895