Year	% (national estimate)
1960	59.85
1976	42.99
1988	57.94
1989	62.41
1990	61.76
1991	62.42
1992	51.7
1995	55.06
1999	41.156
2000	40.412
2001	42.519
2002	39.807
2003	41.232
2004	41.804
2005	42.936
2006	41.721
2007	41.718
2008	41.776
2009	40.461
2010	40.615
2011	38.856
2012	39.184
2013	38.524
2014	40.367
2015	37.976
2016	37.221
2017	36.807
2018	39.431
2019	38.951
2020	38.432
2021	41.96
2022	42.325
2023	43.871