Year % of adults 2004 3.54 2005 3.54 2006 3.54 2007 3.54 2008 3.54 2009 3.54 2010 3.54 2011 4.82 2012 6.24 2013 5.2375 2014 3.1875 2015 2.9625 2016 4.2125 2017 3.825 2018 4.85 2019 5.1