Year	% (national estimate)
1960	82.54341610442395
1970	70.27260076910927
1980	71.33941654185455
1990	70.91969104979172
1991	72.86355243471175
1992	74.53886048931632
1993	74.638444188844
1995	72.50651798451726
1996	71.33272986132611
1997	71.95417291320491
1998	71.77103641928622
1999	71.33365763351533
2001	69.6757173264868
2002	70.03050421248221
2003	69.09292683959585
2004	67.98621556654663
2005	66.99880014457246
2006	68.33054457364634
2007	66.58098511620894
2008	65.25833700185237
2009	65.26197153033014
2011	63.33047359793164
2012	62.83745681155048
2013	61.215812642908155
2014	60.727606155972275
2015	61.06301145185186
2016	60.342502461389245
2017	59.54032514200556
2018	59.524344401675
2019	59.73374109058654
2020	54.39187474842025
2021	58.435874656172906
2022	58.593225455924106
2023	56.612274936159096