Year Number 1996 73.5 1998 71.6417922973633 2000 71.6417922973633 2002 62.6865653991699 2003 66.6666641235352 2004 56.25 2005 59.6153831481934 2006 57.211540222168 2007 53.3653831481934 2008 57.211540222168 2009 56.8720397949219 2010 68.2464447021484 2011 67.6056365966797 2012 69.4835662841797 2013 73.2394332885742 2014 81.7733993530273 2015 82.2660064697266 2016 77.8325119018555 2017 77.3399047851563 2018 81.5533981323242 2019 78.260871887207 2020 80.6763305664063 2021 87.4396133422852 2022 88.4057998657227