Year % of adults 2000 18.6698717622364 2005 17.9831370698867 2010 17.2893086263618 2011 17.1875025896922 2012 17.0896292633127 2013 16.9492717359516 2014 16.8604378952817 2015 16.7253267883365 2016 16.5836924037594