# year    value 
 1940 -0.5441134 
 1941 -0.4963788 
 1942 -0.5697087 
 1943 -0.5446882 
 1944 -0.5057495 
 1945 -0.5582965 
 1946 -0.5798574 
 1947 -0.5391478 
 1948 -0.513959 
 1949 -0.5166538 
 1950 -0.4880232 
 1951 -0.5312542 
 1952 -0.5704088 
 1953 -0.4816419 
 1954 -0.5606878 
 1955 -0.4785522 
 1956 -0.5621702 
 1957 -0.5330084 
 1958 -0.6084045 
 1959 -0.5214786 
 1960 -0.5369295 
 1961 -0.5400725 
 1962 -0.5100572 
 1963 -0.6267567 
 1964 -0.7986664 
 1965 -0.7903487 
 1966 -0.7107419 
 1967 -0.7336398 
 1968 -0.7739769 
 1969 -0.8061517 
 1970 -0.6597284 
 1971 -0.57855 
 1972 -0.5686618 
 1973 -0.5574541 
 1974 -0.5136487 
 1975 -0.5974504 
 1976 -0.5307704 
 1977 -0.4564423 
 1978 -0.3847453 
 1979 -0.3510108 
 1980 -0.3508272 
 1981 -0.2603174 
 1982 -0.3724269 
 1983 -0.6552112 
 1984 -0.4362433 
 1985 -0.3768013 
 1986 -0.3057711 
 1987 -0.2875642 
 1988 -0.1292906 
 1989 -0.1019442 
 1990 -0.07756705 
 1991 -0.102344 
 1992 -0.5610439 
 1993 -0.4517345 
 1994 -0.184867 
 1995 -0.1161347 
 1996 -0.02099742 
 1997 0.03740883 
 1998 0.1217819 
 1999 0.06928709 
 2000 0.2637662 
 2001 0.3224052 
 2002 0.3023071 
 2003 0.3931492 
 2004 0.3945682 
 2005 1.499277