Year	% of adults
2004	1.6
2005	2.1
2006	2.5
2007	6.1
2008	14.6
2009	24.3
2010	23.3
2011	25.5
2012	28.3
2013	25.4
2014	27.4
2015	27.5
2016	30.5
2017	32.2
2018	34.5
2019	36.4