Year	% (national estimate)
1991	50.26312423733456
1992	54.58071371977624
1993	54.99744785448291
1995	55.907227997214086
1996	57.120144532737484
1997	58.091967436559344
1998	58.368051078460304
1999	59.39995204975982
2001	61.94942270626291
2002	62.90791010984589
2003	64.02803147410421
2004	64.32457370015072
2005	65.33719501112432
2006	65.14794366884419
2007	65.73212615943048
2008	65.6552246356402
2009	66.68777477380672
2011	65.7597340207975
2012	66.13168715752252
2013	66.17887496133085
2014	65.90940283265653
2015	66.43396732132749
2016	66.84883821937058
2017	67.62286316945962
2018	68.31256780765693
2019	69.18871458533629
2020	67.47495763178716
2021	68.28251303591345
2022	69.13541024468495
2023	69.55894901167217