Year	% (national estimate)
1986	30.397
1987	33.534
1988	35.097
1989	37.586
1990	38.337
1991	37.898
1992	35.838
1993	29.313
1994	27.826
1995	28.349
1996	27.917
1997	29.511
1998	31.839
1999	35.732
2000	37.519
2001	39.63
2002	40.398
2003	39.861
2004	40.091
2005	43.754
2006	44.579
2007	44.088
2008	39.384
2009	29.402
2010	25.612
2011	22.071
2012	18.405
2013	17.366
2014	17.527
2015	18.579
2016	19.505
2017	21.173
2018	22.712
2019	24.273
2020	20.325
2021	21.896
2022	24.411
2023	24.992