Year Number 1996 55.7377052307129 1998 59.0163917541504 2000 59.5628433227539 2002 58.9189186096191 2003 60.5405387878418 2004 60.6965179443359 2005 59.3137245178223 2006 64.3902435302734 2007 69.4174728393555 2008 68.4466018676758 2009 66.9856491088867 2010 66.5071792602539 2011 66.3507080078125 2012 63.9810409545898 2013 63.5071105957031 2014 73.5576934814453 2015 74.2857131958008 2016 72.8571395874023 2017 74.2857131958008 2018 76.1904754638672 2019 77.6190490722656 2020 82.3809509277344 2021 84.2857131958008 2022 77.3584899902344