Year	% (national estimate)
1976	42.8
1978	74.73
1979	70.47
1980	74.97
1982	76.63
1984	75.38
1987	76.04
1988	77.06
1989	77.5
1990	75.5
1994	58.95
1996	56.63
1997	55.32
1998	51.4
1999	48.63
2000	48.78
2001	47.73
2003	44.82
2004	45.24
2005	45.48
2006	40.38
2007	41.95
2008	40.53
2009	40.79
2010	38.853
2011	39.59
2012	38.84
2013	34.876
2014	34.946
2015	34.454
2016	34.33
2017	33.518
2018	33.97
2019	33.37
2020	33.178
2021	32.435
2022	32.955
2023	34.468