Year	% (national estimate)
1965	55.88
1975	70.34
1976	70.75
1982	67.05
1983	65.6
1984	64.43
1985	65.56
1986	66.97
1987	66.12
1989	69.34
1990	69.301
1991	65.858
1992	60
1993	55.146
1994	53.725
1995	44.153
1996	43.609
1997	42.335
1998	42.858
1999	43.139
2000	41.053
2001	52.18
2002	50.464
2003	50.516
2004	48.883
2005	49.105
2006	50.827
2007	51.764
2008	52.617
2009	51.058
2010	51.959
2011	53.177
2012	51.774
2013	53.871
2014	54.882
2015	53.838
2016	54.182
2017	54.079
2018	52.833
2019	53.945
2020	52.22
2021	53.268
2022	57.186
2023	57.771