Year	% (national estimate)
2006	34.05344852656558
2007	33.52518408407202
2008	32.942415379717644
2009	32.2925409581916
2010	31.690858021835194
2011	30.47891365006861
2012	30.982681067340646
2014	29.238624092939855
2015	28.705420457307728
2016	28.755943658110304