Year Number 1996 70.3517608642578 1998 73.5 2000 81.0945281982422 2002 77.6119384765625 2003 68.1592025756836 2004 67.788459777832 2005 57.8947372436523 2006 62.6794242858887 2007 63.1578941345215 2008 65.8653869628906 2009 63.9810409545898 2010 64.9289093017578 2011 65.2582168579102 2012 64.7887344360352 2013 65.7276992797852 2014 61.538459777832 2015 63.8095245361328 2016 62.3809509277344 2017 63.3333320617676 2018 66.1904754638672 2019 63.3333320617676 2020 64.2857131958008 2021 63.3333320617676 2022 61.3207550048828