Year % of adults 2004 0 2005 0.1 2006 0.1 2007 0.2 2008 0.2 2009 0.3 2010 0.3 2011 0.3 2012 0.5 2013 0.7 2014 1 2015 1.3 2016 1.8 2017 1.7 2018 2.7 2019 7.3