Year	% (national estimate)
1962	49.42
1968	56
1975	48.48
1979	52.47
1980	52.28
1981	50.91
1982	51.35
1983	57.871
1984	55.82
1985	55.281
1986	54.98
1987	53.045
1988	49.387
1989	47.984
1990	47.737
1991	42.117
1992	41.936
1993	39.966
1994	38.406
1995	37.29
1996	37.385
1997	36.41
1998	36.275
1999	39.501
2000	38.593
2001	39.225
2002	41.018
2003	40.68
2004	40.116
2005	37.577
2006	37.829
2007	37.774
2008	38.361
2009	38.851
2010	38.326
2011	37.086
2012	36.477
2013	38.821
2014	37.731
2015	37.976
2016	37.765
2017	38.354
2018	39.22
2019	37.8
2020	36.483
2021	39.987
2022	42.771
2023	44.903