# year    value 
 1940 -0.4458662 
 1941 -0.3962232 
 1942 -0.5287481 
 1943 -0.4766551 
 1944 -0.4506879 
 1945 -0.4694802 
 1946 -0.5107322 
 1947 -0.4906919 
 1948 -0.5679706 
 1949 -0.3990501 
 1950 -0.3734153 
 1951 -0.3564033 
 1952 -0.4089256 
 1953 -0.3285794 
 1954 -0.4822374 
 1955 -0.5077533 
 1956 -0.5249334 
 1957 -0.5282992 
 1958 -0.5348986 
 1959 -0.5336544 
 1960 -0.4899282 
 1961 -0.4161264 
 1962 -0.4896808 
 1963 -0.4921365 
 1964 -0.7934364 
 1965 -0.7427934 
 1966 -0.7228145 
 1967 -0.6251466 
 1968 -0.6225926 
 1969 -0.752557 
 1970 -0.6206731 
 1971 -0.4743167 
 1972 -0.5123808 
 1973 -0.5371558 
 1974 -0.5171588 
 1975 -0.5377119 
 1976 -0.4749055 
 1977 -0.446306 
 1978 -0.3825125 
 1979 -0.2296685 
 1980 -0.3286064 
 1981 -0.2167067 
 1982 -0.4639444 
 1983 -0.6759285 
 1984 -0.4496178 
 1985 -0.4095608 
 1986 -0.1871941 
 1987 -0.306738 
 1988 -0.1755217 
 1989 -0.1133147 
 1990 -0.1773223 
 1991 -0.08704196 
 1992 -0.6277745 
 1993 -0.4811592 
 1994 -0.03217315 
 1995 -0.2073758 
 1996 -0.07407499 
 1997 0.1460572 
 1998 0.2465748 
 1999 0.03958048 
 2000 0.3858355 
 2001 0.1885323 
 2002 0.2907951 
 2003 0.4036689 
 2004 0.3898628 
 2005 1.296646