Year	% (national estimate)
1973	37.64
1976	33.38
1985	41.93
1986	42.01
1987	43.29
1988	43.4
1989	42.043
1990	42.445
1992	48.426
1993	51
1995	45.707
1996	43.788
1997	44.018
1998	43.87
1999	44.471
2001	46.951
2002	48.304
2003	48.07
2004	49.402
2005	50.038
2006	50.491
2007	50.439
2008	50.82
2009	50.451
2011	49.026
2012	47.629
2013	47.747
2014	48.032
2015	47.574
2016	46.04
2017	46.106
2018	46.595
2019	47.292
2020	42.096
2021	43.779
2022	47.571
2023	47.958