Year % of adults 2000 4.47208362407763 2005 3.55570188261955 2010 2.84852161259998 2011 2.72450199042221 2012 2.5996297743203 2013 2.51377963050128 2014 2.40111719233111 2015 2.31682076251473 2016 2.22950220238088