Year Number 1996 81.1827926635742 1998 82.8877029418945 2000 82.9787216186523 2002 76.1904754638672 2003 76.1904754638672 2004 71.9211807250977 2005 72.1951217651367 2006 73.1707305908203 2007 74.271842956543 2008 74.271842956543 2009 80.3827743530273 2010 80 2011 78.1990509033203 2012 76.7772521972656 2013 77.2511825561523 2014 79.3269195556641 2015 78.5714263916016 2016 79.523811340332 2017 72.3809509277344 2018 76.6666641235352 2019 79.0476226806641 2020 80.476188659668 2021 77.1428604125977 2022 75.9433975219727