Year	% (national estimate)
1999	37.16
2000	37.05
2001	36.38
2002	34.78
2003	38.22
2004	32.21
2005	33.81
2006	30.7
2007	31.2
2008	36.16
2009	38.521
2010	39.439
2011	41.227
2012	41.704
2013	40.749
2014	41.446
2015	42.373
2016	39.885
2017	44.438
2018	40.443
2019	38.078
2020	38.869