Year % of adults 2004 0 2005 0 2006 0 2007 0 2008 0 2009 0 2010 4.5 2011 24.4 2012 31.9 2013 33.3 2014 33.8 2015 46.6 2016 50.5 2017 55.8 2018 58.3 2019 60.7