Year % of adults 2004 1.0333333333333334 2005 0.96875 2006 0.96875 2007 0.96875 2008 1.0625 2009 1.0303030303030303 2010 1.7393939393939393 2011 1.9848484848484849 2012 2.0250000000000004 2013 2.2891891891891887 2014 3.164864864864865 2015 2.9131578947368424 2016 3.060526315789474 2017 3.331578947368421 2018 3.797368421052631 2019 4.973684210526315