Year | Value | 2022 | 77.349691077795 | 2021 | 77.077450222134 | 2020 | 76.795598098587 | 2019 | 77.139697460405 | 2018 | 76.809199508764 | 2017 | 76.640532409518 | 2016 | 76.785788730111 | 2015 | 77.545085173977 | 2014 | 78.238581614955 | 2013 | 78.668129899657 | 2012 | 78.99353978671 | 2011 | 79.31002063148 | 2010 | 79.559822180527 | 2009 | 79.866897762371 | 2008 | 80.171333530792 | 2007 | 80.342224870599 | 2006 | 80.431581467736 | 2005 | 80.488957635129 | 2004 | 80.564598905562 | 2003 | 80.625351891375 | 2002 | 80.875130329803 | 2001 | 81.222852121046 | 2000 | 81.521146388754 | 1999 | 81.871493932763 | 1998 | 82.187874204323 | 1997 | 79.333564510536 | 1996 | 80.782847335649 | 1995 | 83.381536325775 | 1994 | 81.485122210414 | 1993 | 80.793010255081 | 1992 | 81.046570798545 | 1991 | 80.973706884308 |
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