Year	% (national estimate)
1990	31.9
1991	32
1992	33.1
1993	33.3
1994	31.1
1995	31.5
1996	31.7
1997	33.6
1998	35
1999	35.8
2000	37.2
2001	35.5
2002	37.6
2003	41.2
2004	42.391
2005	42.786
2006	43.921
2007	43.4
2008	43.735
2009	44.301
2010	43.643
2011	44.146
2012	44.13
2013	43.902
2014	43.722
2017	43.474
2018	44.319
2019	44.924
2020	41.021
2021	45.52
2022	48.09
2023	49.56