Year % of adults 2004 0 2005 0 2006 0 2007 0 2008 0 2009 0 2010 0.04782608695652174 2011 0.22608695652173913 2012 0.45 2013 0.7625000000000001 2014 0.9125 2015 1.024 2016 1.0120000000000002 2017 2.1359999999999997 2018 2.556 2019 3.668