Year	% (national estimate)
1975	53.06
1990	69.926
1991	68.61
1992	66.091
1993	62.496
1994	61.328
1995	60.973
1996	52.439
1997	50.992
1998	50.581
1999	52.553
2000	53.636
2001	56.04
2002	56.01
2003	55.959
2004	54.945
2005	54.435
2006	54.939
2007	55.826
2008	55.876
2009	54.63
2010	61.389
2011	62.596
2012	63
2013	63.267
2014	63.796
2015	64.436
2016	65.085
2017	65.696
2018	66.231
2019	66.097
2020	64.556
2021	57.337
2022	58.532
2023	59.318