Year % of adults 2000 8.13108622252852 2005 5.70085478139273 2010 4.12909429026957 2011 3.86813923918608 2012 3.6332647293882 2013 3.40617751021774 2014 3.23454410076213 2015 3.06096301036794 2016 2.89557286655674