Year % of adults 2004 0 2005 0.002564102564102564 2006 0.0025 2007 0.005 2008 0.0075000000000000015 2009 0.017499999999999998 2010 0.11000000000000001 2011 0.24500000000000002 2012 0.6857142857142858 2013 1.2116279069767442 2014 1.3976744186046512 2015 1.7909090909090912 2016 2.3454545454545457 2017 2.9749999999999996 2018 3.438636363636364 2019 4.461363636363637