Year	% (national estimate)
1983	33.52461607009554
1984	34.397921716014885
1985	36.06320160141703
1986	34.44945648454909
1987	34.834687191538386
1988	35.37121681574742
1989	35.94440021040971
1990	37.488556817427295
1991	38.49562055744125
1992	38.2048103524148
1993	37.71072743629615
1994	37.70155626762106
1995	37.989006332108694
1996	38.27933133037585
1997	38.610951472381394
1998	39.28574026188166
1999	40.31505690056513
2000	41.15172122360355
2001	41.891698406749654
2002	42.5154334209333
2003	43.10947049911618
2004	43.249148713945296
2005	43.880211730987384
2006	44.794507672537456
2007	45.746697857642026
2008	46.24773374095748
2009	45.895262122627635
2010	45.60071700267642
2011	45.90419168315645
2012	45.71410789749198
2013	45.607694979512544
2014	45.86047405127322
2015	46.25036716377069
2016	46.95804171654022
2017	47.586250362370876
2018	48.13936117448308
2019	48.784665394210194
2020	47.752821274742516
2021	48.60902415968258
2022	49.72915158447675
2023	48.9442587466163