Year Number 1996 76.881721496582 1998 75.9358291625977 2000 76.5957412719727 2002 59.2592582702637 2003 60.8465614318848 2004 58.6206893920898 2005 59.0243911743164 2006 61.4634132385254 2007 66.5048522949219 2008 73.7864074707031 2009 66.0287094116211 2010 66.6666641235352 2011 64.9289093017578 2012 66.8246459960938 2013 66.3507080078125 2014 62.5 2015 63.3333320617676 2016 62.3809509277344 2017 62.8571434020996 2018 63.3333320617676 2019 62.8571434020996 2020 61.9047622680664 2021 61.4285697937012 2022 60.8490562438965