Year	% (national estimate)
1960	81.4227722335263
1970	69.5336074136505
1980	70.00187801022936
1990	69.23552429679835
1991	71.10630786329325
1992	72.55066845403022
1993	72.50658198956029
1995	70.92165273751819
1996	70.00108296344204
1997	70.71090668226266
1998	70.54361498531797
1999	70.34047130648362
2001	68.680250372642
2002	68.8218181147249
2003	67.89823541731164
2004	67.05061980246346
2005	65.67454745019226
2006	66.78011469570605
2007	65.19246147205835
2008	64.07500035846819
2009	64.08190749410015
2011	62.02988344831232
2012	61.51587042813549
2013	60.60591090017953
2014	60.14406267911653
2015	60.376342040119944
2016	58.86052835583077
2017	58.624194924331086
2018	58.84915190030267
2019	58.95006320673838
2020	53.25278234661883
2021	57.54203644655235
2022	57.81318767905311
2023	55.87001487958389