Year | Value | 2021 | 79.417850283161 | 2020 | 79.417850283161 | 2019 | 79.417850283161 | 2018 | 79.417850283161 | 2017 | 79.417850283161 | 2016 | 79.417850283161 | 2015 | 79.417850283161 | 2014 | 79.417850283161 | 2013 | 79.417850283161 | 2012 | 79.417850283161 | 2011 | 79.445053540957 | 2010 | 79.871237913098 | 2009 | 79.951199004196 | 2008 | 80.050119941637 | 2007 | 79.870413571953 | 2006 | 79.868764889662 | 2005 | 80.359247871139 | 2004 | 80.462290514306 | 2003 | 80.726079680815 | 2002 | 80.808513795349 | 2001 | 80.796148678169 | 2000 | 80.888474886447 | 1999 | 80.833244029709 | 1998 | 80.775540149536 | 1997 | 80.740093480286 | 1996 | 80.694754717292 | 1995 | 80.389748493517 | 1994 | 80.179541501455 | 1993 | 79.908333264638 | 1992 | 79.526663314346 | 1991 | 79.140871658327 | 1990 | 78.807013494465 | 1989 | 78.559711150863 | 1988 | 78.229974692727 | 1987 | 78.023889406392 | 1986 | 77.817804120057 | 1985 | 77.515270919717 | 1984 | 77.515270919717 | 1983 | 77.515270919717 | 1982 | 77.515270919717 | 1981 | 77.524338672316 | 1980 | 77.533406424915 | 1979 | 77.53423076606 | 1978 | 77.543298518659 | 1977 | 77.535879448351 | 1976 | 77.54494720095 | 1975 | 77.73949171125 | 1974 | 77.94640133873 | 1973 | 78.124459026123 | 1972 | 78.319003536423 | 1971 | 78.50530463527 | 1970 | 78.695727439844 | 1969 | 78.886150244417 | 1968 | 79.076573048991 | 1967 | 79.258752442111 | 1966 | 79.486270598224 | 1965 | 79.639598051257 | 1964 | 80.579346956945 | 1963 | 81.605651682892 | 1962 | 82.54540058858 | 1961 | 83.534609962987 |
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