Year	% (national estimate)
1979	40.014
1980	41.246
1981	41.422
1982	40.836
1983	40.03
1984	41.007
1985	42.223
1986	44.09
1987	44.716
1988	45.924
1989	47.723
1990	48.488
1991	47.232
1992	46.798
1993	46.545
1994	47.686
1995	49.268
1996	49.369
1997	49.27
1998	49.717
1999	50.068
2000	51.216
2001	51.52
2002	51.862
2003	52.593
2004	52.622
2005	54.013
2006	54.717
2007	55.318
2008	55.887
2009	55.594
2010	55.485
2011	55.767
2012	55.661
2013	55.42
2014	55.049
2015	55.532
2016	55.924
2017	56.469
2018	57.299
2019	57.854
2020	56.385
2021	58.164
2022	60.063
2023	60.387