Year Number 1996 82.5136642456055 1998 84.6994552612305 2000 85.792350769043 2002 83.2432403564453 2003 85.405403137207 2004 83.5820922851563 2005 77.9411773681641 2006 82.4390258789063 2007 83.4951477050781 2008 84.4660186767578 2009 84.2105255126953 2010 84.6889953613281 2011 84.3601913452148 2012 82.4644546508789 2013 81.9905242919922 2014 73.5576934814453 2015 76.1904754638672 2016 77.6190490722656 2017 73.3333358764648 2018 74.2857131958008 2019 73.3333358764648 2020 70.9523773193359 2021 70.476188659668 2022 71.698112487793