Year % of adults 2000 4.21761916989866 2005 3.50099566788303 2010 2.96929538401853 2011 2.8457970988207 2012 2.81183799381619 2013 2.69044974235537 2014 2.58846967444892 2015 2.5489005124731 2016 2.45331470485551