Year	% (national estimate)
1989	53.8
1992	54.665
1993	52.532
1994	50.869
1995	50.415
1996	47.069
1997	43.215
1998	40.538
1999	45.171
2000	43.641
2001	40.835
2002	40.509
2003	39.174
2004	39.373
2005	39.201
2006	38.892
2007	39.406
2008	41.838
2009	42.1
2010	41.232
2011	41.392
2012	39.575
2013	39.874
2014	38.788
2015	37.921
2016	37.668
2017	35.372
2018	34.128
2019	33.106
2020	32.094
2021	31.706
2022	29.152
2023	29.205