Year	% (national estimate)
1978	44.75
1979	45.39
1980	45.22
1983	52.406
1984	53.272
1985	54.037
1986	54.036
1987	54.69
1988	56.371
1989	58.228
1990	58.631
1991	57.3
1992	56.291
1993	55.484
1994	55.784
1995	56.22
1996	56.633
1997	57.486
1998	57.929
1999	57.946
2000	58.469
2001	58.656
2002	58.679
2003	58.9
2004	59.039
2005	59.094
2006	59.125
2007	59.002
2008	58.987
2009	57.575
2010	57.182
2011	57.025
2012	57.139
2013	57.518
2014	58.487
2015	59.096
2016	59.642
2017	59.873
2018	60.285
2019	60.639
2020	59.992
2021	59.171
2022	59.873
2023	59.723