Year	% (national estimate)
1960	52.10098936797884
1970	47.85395842208338
1980	51.9149507961889
1990	54.44538125659086
1991	56.77942328879727
1992	59.7381362350985
1993	59.00160573189595
1995	58.46461662230568
1996	57.58111840200581
1997	58.51867740408484
1998	58.419820640515866
1999	58.23926002598629
2001	57.469596331965
2002	58.568536069541906
2003	57.558548573273555
2004	56.97076381346622
2005	56.613051041925985
2006	57.15528015311894
2007	56.21335506204116
2008	55.2364468234402
2009	55.19161816135783
2011	53.14085625461637
2012	52.51437691882386
2013	51.129073670308614
2014	50.50970436802351
2015	50.9438286862083
2016	50.847991891657024
2017	50.26987149216795
2018	50.41224806469335
2019	50.887465121198574
2020	46.25366971476725
2021	50.14965296699351
2022	50.272435747333894
2023	49.04428389821698