Year % of adults 2004 52.2 2005 52.2 2006 52.2 2007 48.7 2008 48.6 2009 47.4 2010 50.5 2011 48.5 2012 47.5 2013 46.5 2014 45.5 2015 44.6 2016 45.3 2017 44.6 2018 24.5 2019 59.9