Year	% of adults
2004	16.6
2005	16.1
2006	16.1
2007	14.5
2008	31.2
2009	30.4
2010	29.6
2011	29
2012	31
2013	29
2014	32
2015	34.2
2016	31
2017	31
2018	30.7
2019	31.6