# year    value 
 1940 -0.504068 
 1941 -0.4841935 
 1942 -0.4430598 
 1943 -0.4116709 
 1944 -0.387038 
 1945 -0.4452182 
 1946 -0.4540767 
 1947 -0.4407345 
 1948 -0.3923329 
 1949 -0.397728 
 1950 -0.4082028 
 1951 -0.4318147 
 1952 -0.4251436 
 1953 -0.4158344 
 1954 -0.4259797 
 1955 -0.4300011 
 1956 -0.4105315 
 1957 -0.4204718 
 1958 -0.3942279 
 1959 -0.3909685 
 1960 -0.3870077 
 1961 -0.421816 
 1962 -0.4317133 
 1963 -0.5299955 
 1964 -0.6747272 
 1965 -0.6127088 
 1966 -0.5837869 
 1967 -0.5485564 
 1968 -0.549061 
 1969 -0.5536238 
 1970 -0.503083 
 1971 -0.4038336 
 1972 -0.390406 
 1973 -0.3608528 
 1974 -0.4043114 
 1975 -0.3966717 
 1976 -0.346583 
 1977 -0.365511 
 1978 -0.3175184 
 1979 -0.2841518 
 1980 -0.1953768 
 1981 -0.178796 
 1982 -0.3316619 
 1983 -0.4269203 
 1984 -0.308674 
 1985 -0.2664052 
 1986 -0.2474017 
 1987 -0.1718565 
 1988 -0.08960971 
 1989 -0.06431182 
 1990 -0.02684646 
 1991 -0.1312572 
 1992 -0.4110336 
 1993 -0.2588776 
 1994 -0.2041869 
 1995 -0.1214085 
 1996 -0.01811857 
 1997 0.05292053 
 1998 0.08723194 
 1999 0.1258209 
 2000 0.1436638 
 2001 0.2329337 
 2002 0.2757359 
 2003 0.2440481 
 2004 0.2559407 
 2005 0.6980689