Year	% (national estimate)
1990	45.913
1991	46.864
1992	44.345
1993	39.545
1994	42.953
1995	41.04
1996	41.978
1997	40.28
1998	39.486
1999	39.655
2000	36.971
2001	35.282
2002	33.03
2003	30.514
2004	30.017
2005	30.229
2006	30.272
2007	30.156
2008	30.313
2009	28.909
2010	29.999
2011	32.053
2012	31.51
2013	32.241
2014	33.521
2015	34.229
2016	34.099
2017	34.321
2018	35.045
2019	33.136
2020	29.189
2021	32.243
2022	35.283
2023	37.562