Year	% (national estimate)
1980	12.58
1989	41.15
1990	39.84
1991	45.8
1992	46.12
1993	50.23
1994	48.82
1997	43.96
1998	44.55
1999	44.46
2000	43.12
2001	43.16
2002	43.005
2003	44.681
2004	43.53
2005	43.871
2007	42.705
2008	43.058
2009	45.487
2010	46.755
2011	47.791
2012	48.941
2013	48.864
2014	48.943
2015	49.27
2016	48.603
2017	48.121
2018	47.018
2019	45.698
2020	40.714
2021	42.39
2022	44.361
2023	45.88