Year	% (national estimate)
1988	32.98
1989	34.41
1990	31.249
1991	31.702
1992	30.195
1993	24.29
1994	28.766
1995	28.671
1996	28.744
1997	26.576
1998	27.275
1999	27.735
2000	24.902
2001	25.11
2002	25.271
2003	23.898
2004	20.771
2005	20.694
2006	20.96
2007	21.02
2008	21.641
2009	22.308
2010	24.029
2011	25.567
2012	26.32
2013	27.094
2014	26.659
2015	27.52
2016	27.995
2017	28.859
2018	29.429
2019	28.695
2020	26.27
2021	27.987
2022	30.347
2023	31.252