Year	% (national estimate)
1975	32.96
1976	34.65
1977	36.23
1978	38.48
1979	40.18
1980	42.8
1982	47.02
1983	47.39
1984	48.14
1985	46.02
1986	45.55
1987	47.85
1988	50.05
1989	51.88
1991	37.09
1992	41.28
1993	40.06
1994	40.41
1995	38.76
1996	39.65
1997	39.03
1998	37.66
1999	48.1
2000	46.89
2001	49.6
2002	47.7
2003	47.7
2004	48.1
2006	51.58
2007	50.76
2008	53.16
2009	51.57
2010	53.97
2011	54.51
2012	55.27
2013	55.55
2014	56.23
2015	58.04
2016	57.68
2017	57.21
2018	57.76
2019	58.32
2020	57.73
2021	60.963
2022	60.948