Year	% (national estimate)
1992	32.347
1993	29.533
1994	28.002
1995	27.315
1996	27.857
1997	27.8
1998	27.787
1999	24.289
2000	24.137
2001	24.191
2002	22.031
2003	21.212
2004	21.061
2005	22.535
2006	23.996
2007	25.837
2008	27.35
2009	26.795
2010	26.394
2011	24.896
2012	24.684
2013	24.207
2014	25.78
2015	26.014
2016	28.415
2017	29.644
2018	30.964
2019	31.714
2020	28.394
2021	27.329
2022	27.78
2023	28.688