Year	% (national estimate)
1963	81.19
1975	74.44
1984	65.11
1985	54.51
1990	37.79
1991	64.36
1992	64.22
1993	63.61
1994	67.33
1995	67.6
1996	68.31
1998	68.045
1999	66.275
2000	65.978
2001	67.377
2002	63.435
2003	60.042
2004	60.797
2005	60.186
2006	61.82
2007	64.523
2008	61.906
2009	61.972
2010	61.899
2011	62.406
2012	60.955
2013	61.447
2014	60.391
2015	57.136
2016	55.632
2017	54.27
2018	52.683
2019	52.319
2020	46.681
2021	50.149
2022	49.573
2023	49.816