Year % of adults 2000 25.4281352867336 2005 22.8652163589345 2010 20.6118928718314 2011 20.1845401504401 2012 19.8237485537841 2013 19.3984750965872 2014 19.0292930774341 2015 18.6728379952454 2016 18.3264464244236