Year	% (national estimate)
1977	42.8
1979	53.61
1980	44.01
1981	54.96
1982	67.49
1984	55.93
1985	56.86
1986	56.3
1987	55.91
1988	55.98
1989	57.31
1990	63.066
1991	60.293
1992	56.152
1993	52.443
1994	51.473
1995	47.173
1996	46.106
1997	46.534
1998	47.64
1999	50.894
2000	51.318
2001	52.23
2002	52.742
2003	52.492
2004	51.69
2005	52.534
2006	53.052
2007	53.25
2008	53.548
2009	52.642
2010	51.743
2011	51.846
2012	52.04
2013	51.361
2014	51.062
2015	50.697
2016	50.296
2017	50.581
2018	51.801
2019	52.343
2020	51.123
2021	52.684
2022	54.464
2023	54.752