Year	% (national estimate)
1976	42.42
1977	42.5
1978	42.5
1979	42.5
1980	42.49
1981	45.76
1982	45.7
1983	44.75
1984	44.73
1985	43.08
1986	42.42
1988	41.87
1989	17.9
1990	41.86
1991	41.76
1992	41.75
1993	40.3
1994	39.51
1995	39.06
1997	41.19
1998	40.26
2000	40.54
2002	43.42
2004	43.58
2005	37.652
2006	42.349
2007	41.273
2008	40.731
2009	41.077
2010	41.583
2011	40.248
2012	38.731
2013	41.404
2014	40.05
2015	40.294
2016	38.43
2018	40.039
2019	39.962
2021	43.737