Year	% (national estimate)
1965	52.28
1975	66.73
1976	67.68
1982	66.7
1983	65.38
1984	64.73
1985	65.97
1986	67.3
1987	66.32
1989	69.29
1990	69.086
1991	65.84
1992	60.37
1993	54.906
1994	53.554
1995	45.458
1996	43.129
1997	41.078
1998	40.617
1999	42.284
2000	40.732
2001	52.358
2002	50.513
2003	50.623
2004	48.549
2005	50.204
2006	51.338
2007	52.241
2008	52.843
2009	51.022
2010	51.631
2011	52.984
2012	52.584
2013	54.497
2014	55.448
2015	55.135
2016	54.84
2017	54.702
2018	54.091
2019	55.016
2020	52.062
2021	54.041
2022	56.914
2023	57.474