Year % (national estimate) 2005 28.69290873416407 2006 27.65986982431608 2007 27.345770983036598 2008 26.555662238746358 2009 26.55489722181339 2010 26.114838057050484 2011 27.162551083776084 2012 27.193638435139196 2013 27.29221368901685 2014 25.38489574438635 2015 28.224179609641475 2016 28.281753245186675 2021 21.67936743295006