Year % of adults 2000 42.4751992812258 2005 38.0347574009796 2010 34.1420039475207 2011 33.4438891141813 2012 32.7704765483492 2013 32.0882207075481 2014 31.3791453362254 2015 30.7750451329037 2016 30.1297322642326