Year	% (national estimate)
1973	40.97
1975	40.44
1977	41.79
1978	42.11
1979	38.86
1980	38.63
1981	24
1982	23.77
1983	43.57
1984	43.49
1989	48.73
1990	45.33
1991	41.41
1992	42.83
1993	42.69
1994	43.38
1995	42.35
1996	42.3
1998	41.3
1999	42.76
2000	26.94
2001	40.97
2002	38.23
2008	43.501
2009	43.549
2010	45.045
2011	43.005
2012	42.385
2013	42.065
2014	41.811
2015	40.846
2016	40.825
2017	39.661
2018	39.031
2019	38.885
2020	38.297
2021	39.789
2022	39.691