Year % of adults 2004 0 2005 0 2006 0 2007 0 2008 6.8 2009 9.9 2010 12.3 2011 17 2012 19.7 2013 13.1 2014 16.7 2015 27.1 2016 38.9 2017 51.6 2018 57.4 2019 56.2