Year Number 2004 54.8543701171875 2005 68.9320373535156 2006 68.1159439086914 2007 71.0144958496094 2008 72.1153869628906 2009 67.7725143432617 2010 66.3507080078125 2011 70.6161117553711 2012 72.9857788085938 2013 73.459716796875 2014 72.3809509277344 2015 71.9047622680664 2016 75.7142868041992 2017 77.6190490722656 2018 79.2452850341797 2019 77.3584899902344 2020 79.7169799804688 2021 83.4905624389648 2022 83.9622650146484