Year % (national estimate) 2009 36.2 2010 32.939 2011 34.189 2012 34.697 2013 36.871 2014 36.079 2015 37.447 2016 38.337 2017 38.208 2018 37.844 2019 37.803 2020 31.555 2021 31.652 2022 29.175 2023 28.515