Year	% (national estimate)
1999	31.89
2000	29.18
2001	27.88
2002	26.5
2003	30.84
2004	24.98
2005	25.64
2006	23
2007	22.7
2008	24.95
2009	29.147
2010	28.806
2011	29.884
2012	29.825
2013	27.564
2014	28.26
2015	31.433
2016	27.259
2017	38.13
2018	32.397
2019	29.348
2020	29.394