Year	% (national estimate)
1981	55.59114357974492
1983	54.891225141922305
1984	57.28279107142728
1985	56.25203085806982
1986	56.287306497861884
1987	56.543712833427
1988	55.7137142658184
1989	54.277661825551824
1990	54.2027224988257
1991	52.839069866302225
1992	50.8009744627746
1993	49.266471920555276
1994	48.00400476718407
1995	46.642728936577875
1996	46.064279690052416
1997	46.01040662051182
1998	46.7563810356121
1999	47.50514163269288
2000	47.47264714647468
2001	47.21653104844197
2002	47.46020030518144
2003	47.05722848486936
2004	46.77120644644596
2005	46.393910465921316
2006	46.4572830233353
2007	46.42475115441519
2008	46.781160387246004
2009	45.511093058559254
2010	44.509155053492464
2011	43.426444352519944
2012	43.083826673138475
2013	43.118222157167416
2014	42.29243284687295
2015	41.730480168821956
2016	41.50998882371662
2017	41.58725777405359
2018	42.10974951774152
2019	42.21735395407048
2020	40.61324559633057
2021	42.79854334110981
2022	44.094619986568766
2023	45.19622005140466