Year % of adults 2004 0 2005 0 2006 0 2007 0 2008 0 2009 0 2010 15.7 2011 15.7 2012 15.7 2013 16.7 2014 28.7 2015 28.2 2016 27.9 2017 27.4 2018 36.6 2019 40.7