Year % (national estimate) 2005 47.71 2006 40.6 2009 48.6 2010 40.38 2011 37.97 2012 32.31 2014 26.91 2015 29.62 2018 26.118 2019 26.596 2020 27.183 2021 27.337 2022 29.338 2023 31.094