Year	% of adults
2004	3.1
2005	3.5
2006	4.3
2007	4.7
2008	6.8
2009	8.3
2010	8.7
2011	16.6
2012	18.6
2013	19.2
2014	20.3
2015	23.9
2016	22
2017	22.9
2018	23.6
2019	21.3