Year	% (national estimate)
1962	86.24
1974	72.18
1980	69.23
1981	68.75
1982	60.56
1988	59.42
1989	59.28
1990	64.93
1996	57.63
1997	58.14
1998	63.21
2000	64.533
2001	70.312
2002	59.69
2003	64.402
2004	64.849
2005	64.456
2006	67.207
2007	61.961
2008	62.031
2009	58.15
2010	55.3
2011	52.925
2012	54.025
2013	51.156
2014	51.763
2015	53.078
2016	54.427
2017	55.059
2018	53.716
2019	53.066
2020	48.354
2021	55.891
2022	54.28
2023	52.647