Year Number 1996 91 1998 91.0447769165039 2000 89.0547256469727 2002 92.0398025512695 2003 91.0447769165039 2004 89.9038467407227 2005 89.9038467407227 2006 86.538459777832 2007 85.5769195556641 2008 86.538459777832 2009 84.8341217041016 2010 85.7819900512695 2011 86.3849792480469 2012 87.7934265136719 2013 84.0375595092773 2014 81.7733993530273 2015 84.2364501953125 2016 84.2364501953125 2017 80.7881774902344 2018 80.0970840454102 2019 77.2946853637695 2020 72.9468612670898 2021 74.3961334228516 2022 72.9468612670898