Year % (national estimate) 2009 34.3 2010 31.665 2011 33.004 2012 33.525 2013 35.187 2014 34.947 2015 36.022 2016 36.713 2017 36.394 2018 36.541 2019 36.409 2020 30.378 2021 30.397 2022 28.411 2023 27.88