Year	% of adults
2004	1
2005	1.2
2006	1.5
2007	1.7
2008	2.2
2009	2.5
2010	2.9
2011	3.5
2012	4.3
2013	5.3
2014	5.8
2015	6.6
2016	7.1
2017	7.8
2018	8.4
2019	9.5