Year	% (national estimate)
1960	66.5
1970	65.26
1980	63.36
1990	66.6
1991	66.909
1992	66.231
1993	68.933
1994	64.753
1995	61.851
1996	64.516
1997	64.817
1998	63.527
1999	69.337
2000	65.979
2001	66.885
2002	68.098
2003	68.265
2004	65.952
2005	64.704
2006	67.032
2007	64.468
2008	66.126
2009	68.485
2010	67.384
2011	67.895
2012	66.235
2013	67.069
2014	67.454
2015	68.314
2016	68.961
2017	67.762
2018	67.625
2019	66.307
2020	64.571
2021	64.178
2022	63.387
2023	64.427