Year % of adults 2000 28.2084693210356 2005 24.5654239132335 2010 21.3980173386831 2011 20.8768692486759 2012 20.4344495954527 2013 19.8225803432043 2014 19.311488329902 2015 18.8920871286563 2016 18.3698976037458