Year	% (national estimate)
1980	63.072059215662854
1981	61.53323792971904
1983	59.877018299720724
1984	60.75037614414216
1985	61.15755504758764
1986	60.21737912187865
1987	59.99361389350286
1988	59.976806821538396
1989	59.91617082968296
1990	59.87248735430103
1991	60.28468388046336
1992	59.31717113286617
1993	58.58795806530738
1994	58.36747962089909
1995	57.52677866090639
1996	57.13236953956066
1997	56.74617458406702
1998	56.708665995548586
1999	56.56039627019885
2000	56.443906585597674
2001	56.12663183342249
2002	55.25573412355668
2003	54.44198639903905
2004	54.15727084173719
2005	53.91332454095574
2006	53.68542107389079
2007	53.48913591961426
2008	53.29798835086516
2009	52.08501756315188
2010	51.34620464319957
2011	51.202721012875976
2012	51.05818896452505
2013	50.99038113025455
2014	50.99941009898962
2015	50.86414195461648
2016	50.78591648242304
2017	50.798275867480534
2018	50.89510581232248
2019	51.07789643183622
2020	48.68821066462161
2021	50.553430375838644
2022	51.203770511352566
2023	51.66272396577119