Year	% (national estimate)
1992	35.39
1993	31.498
1994	30.818
1995	31.254
1996	27.358
1997	28.594
1998	33.611
1999	34.909
2000	33.125
2001	30.425
2002	28.633
2003	26.651
2004	23.326
2005	21.827
2006	21.605
2007	21.091
2008	20.226
2009	18.143
2010	18.252
2011	17.978
2012	18.449
2013	20.111
2014	23.503
2015	25.658
2016	28.116
2017	28.965
2018	28.982
2019	28.519
2020	27.217
2021	27.489
2022	27.577
2023	27.386