Year | Value | 2022 | 81.222428344052 | 2021 | 80.958714137567 | 2020 | 80.692043884686 | 2019 | 80.421853538968 | 2018 | 80.149895781578 | 2017 | 79.875163851765 | 2016 | 79.595937452554 | 2015 | 79.312923536906 | 2014 | 79.025568652348 | 2013 | 78.735070023619 | 2012 | 78.441766898773 | 2011 | 78.142305254425 | 2010 | 77.834346268273 | 2009 | 77.532141475571 | 2008 | 77.221667994818 | 2007 | 76.903182293837 | 2006 | 76.57754836221 | 2005 | 76.247894139547 | 2004 | 75.915260933563 | 2003 | 75.577550194849 | 2002 | 75.225566294816 | 2001 | 74.87046829053 | 2000 | 74.4983239413 | 1999 | 74.030972230834 | 1998 | 73.559580679481 | 1997 | 73.070736846756 | 1996 | 72.577174157179 | 1995 | 72.094137141062 | 1994 | 71.586856030049 | 1993 | 71.074765676622 | 1992 | 70.570239559037 | 1991 | 70.047347130099 | 1990 | 69.499713170711 | 1989 | 68.921806141878 | 1988 | 68.331600500528 | 1987 | 67.731090502004 | 1986 | 67.123355918683 | 1985 | 66.504107699034 | 1984 | 65.869853099765 | 1983 | 65.230394235988 | 1982 | 64.585642415937 | 1981 | 63.933881387984 | 1980 | 63.253444019774 | 1979 | 62.533871570402 | 1978 | 61.804405346532 | 1977 | 61.068167516256 | 1976 | 60.330523841041 | 1975 | 59.594533011812 | 1974 | 58.852705087162 | 1973 | 58.110500947978 | 1972 | 57.362476205957 | 1971 | 56.592112650255 | 1970 | 55.819035928884 | 1969 | 55.058368549337 | 1968 | 54.293451259046 | 1967 | 53.524996997053 | 1966 | 52.757980948199 | 1965 | 51.990745842379 | 1964 | 51.223792316273 | 1963 | 50.39636287974 | 1962 | 49.575305276297 | 1961 | 48.758908930627 | 1960 | 47.967090172573 |
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