Year	% (national estimate)
1992	47.41240274744488
1993	44.584937058169146
1994	43.448554091757494
1995	42.501362898314454
1996	41.53833115546137
1997	40.39283753345567
1998	39.88345195892266
1999	41.322559419311695
2000	41.15685251100056
2001	40.570659005070496
2002	39.785120961131504
2003	38.53234265437153
2004	38.40091983094439
2005	38.126823651113966
2006	38.21079236814744
2007	38.76478015310509
2008	39.53011257591296
2009	36.56092776963316
2010	36.661637189523745
2011	36.96327365893788
2012	35.968916408018394
2013	36.118596077932466
2014	36.186479161256436
2015	36.51197472436599
2016	36.662243175166985
2017	36.87531310397171
2018	37.421151046270374
2019	37.20153440567963
2020	35.30428714990439
2021	35.92946395023973
2022	37.74562448413416
2023	38.69938755349646