Year % (national estimate) 2005 40.91 2006 42.7 2009 52.67 2010 40.29 2011 40.27 2012 35.95 2014 28.4 2015 31.04 2018 24.802 2019 27.229 2020 28.277 2021 28.326 2022 28.21 2023 31.216