Year % of adults 2004 15.320000000000002 2005 14.401886792452832 2006 15.103773584905662 2007 18.0462962962963 2008 17.555555555555557 2009 18.249999999999996 2010 18.72222222222222 2011 19.48888888888889 2012 20.38571428571429 2013 22.07049180327869 2014 22.680327868852455 2015 22.790163934426236 2016 24.118032786885234 2017 25.69016393442623 2018 28.257377049180324 2019 32.00655737704918