Year	% (national estimate)
1999	34.9
2000	34
2001	33.1
2002	32.6
2003	32
2004	32.7
2005	32.7
2006	32.4
2007	34.6
2008	34.5
2009	35
2010	34.5
2011	34
2012	33.4
2013	32.4
2014	32.1
2017	32.937
2018	32.024
2019	32.649
2020	32.272
2021	30.999
2022	31.538