Year	% (national estimate)
1991	34.153
1992	35.056
1993	37.28
1994	36.221
1995	35.999
1996	36.784
1997	39.084
1998	39.298
1999	39.129
2000	39.608
2001	39.006
2002	36.68
2003	37.042
2004	37.83
2005	39.309
2006	40.468
2007	40.743
2008	40.564
2009	40.473
2010	40.311
2011	40.702
2012	41.763
2013	41.763
2014	41.03
2015	41.493
2016	41.787
2017	41.507
2018	42.063
2019	43.194
2020	39.285
2021	41.875
2022	43.536
2023	44.951