Year % of adults 2004 10.9 2005 10.9 2006 10.9 2007 10.9 2008 10.9 2009 10.9 2010 10.9 2011 10.9 2012 10.9 2013 10.9 2014 10.9 2015 15.3 2016 14.5 2017 15 2018 15.5 2019 16.8