Year	% of adults
2004	1.1
2005	1.2
2006	1.2
2007	1.3
2008	1.3
2009	1.4
2010	1.4
2011	1.7
2012	1.8
2013	1.7
2014	2
2015	2.2
2016	2.3
2017	2.2
2018	2.2
2019	2.2