Year % (national estimate) 2001 36.200540281863795 2002 37.41992375774397 2003 35.58045314455884 2004 35.62699091560549 2005 35.509379373349276 2006 36.56036727683643 2007 36.74442404810287 2008 35.99445071623495 2009 34.837790132329786 2011 34.151772847865125 2012 33.969707814909846 2013 33.914631832228785 2014 33.348425654012814 2015 33.00861911146242 2016 31.439475508810247 2017 31.183770150358377 2018 31.844059601712956 2019 32.37138599582526 2020 27.279853754070917 2021 31.467879994624003 2022 33.8505574882866 2023 33.98409968280182