Year % of adults 2004 4.5 2005 4.5 2006 39.2 2007 52.7 2008 51.6 2009 56 2010 64.8 2011 78.9 2012 100 2013 100 2014 100 2015 100 2016 100 2017 100 2018 87.9 2019 86