Year ages 15+ 2000 33.467927783192 2005 30.0243925571417 2010 27.0488605255107 2011 26.5238600727163 2012 26.0399465219191 2013 25.5126582613846 2014 25.0236709055271 2015 24.5553356005302 2016 24.0998747800927