Year	% (national estimate)
1977	27.5
1978	28.48
1985	40.99
1987	42.19
1988	58.09
1989	59.44
1990	60.45
1991	60.08
1992	58.29
1995	58.82
1999	55.456
2000	57.285
2001	59.234
2002	59.823
2003	60.558
2004	59.992
2005	59.846
2006	60.652
2007	61.863
2008	61.86
2009	60.308
2010	60.246
2011	58.729
2012	55.946
2013	53.252
2014	53.493
2015	53.005
2016	53.327
2017	54.822
2018	57.174
2019	58.507
2020	57.935
2021	59.035
2022	60.678
2023	61.418