Year	% (national estimate)
1983	25.324
1984	23.609
1985	23.139
1986	21.926
1987	21.582
1988	21.925
1989	23.133
1990	23.674
1991	22.566
1992	21.77
1993	20.396
1994	20.455
1995	19.692
1996	20.266
1997	19.36
1998	21.805
1999	21.843
2000	22.215
2001	21.624
2002	21.385
2003	19.627
2004	21.267
2005	19.826
2006	18.565
2007	18.554
2008	18.537
2009	18.172
2010	15.996
2011	12.732
2012	9.956
2013	9.105
2014	10.745
2015	10.84
2016	11.228
2017	12.336
2018	11.782
2019	13.18
2020	11.774
2021	11.104
2022	13.121
2023	16.307