Year Number 1996 86.3387985229492 1998 81.9672164916992 2000 80.8743133544922 2002 80 2003 80.5405426025391 2004 79.1044769287109 2005 75.4901962280273 2006 71.2195129394531 2007 72.3300933837891 2008 72.8155364990234 2009 71.291862487793 2010 68.8995208740234 2011 69.1943130493164 2012 68.2464447021484 2013 69.6682434082031 2014 70.6730804443359 2015 66.6666641235352 2016 67.1428604125977 2017 65.2380981445313 2018 67.6190490722656 2019 68.5714263916016 2020 66.1904754638672 2021 61.4285697937012 2022 60.3773574829102