Year % of adults 2005 31.5 2006 31.5 2007 34.4 2008 37.6 2009 41.7 2010 39.2 2011 46 2012 46 2013 63.2 2014 67.4 2015 69.6 2016 72.3 2017 75.5 2018 79.2 2019 81