Year	% (national estimate)
1998	36.315
1999	36.57
2000	35.409
2001	32.894
2002	31.186
2003	37.891
2004	36.348
2005	38.254
2006	41.844
2007	43.788
2008	42.098
2009	29.504
2010	26.459
2011	28.255
2012	31.78
2013	33.261
2014	36.509
2015	37.07
2016	34.013
2017	34.985
2018	35.475
2019	33.933
2020	32.483
2021	30.053
2022	31.44
2023	31.738