Year	% (national estimate)
1991	48.53
1993	31.29
1994	39.46
1995	41.64
1996	42.635
1997	46.064
1998	43.961
1999	40.408
2000	37.295
2001	35.975
2002	36.566
2003	33.751
2004	39.332
2005	40.519
2006	40.615
2007	41.83
2008	42.884
2009	40.881
2010	39.926
2011	37.422
2012	34.373
2013	33.834
2014	33.597
2015	35.345
2016	33.745
2017	39.125
2018	38.556
2019	36.218
2020	31.453
2021	33.865
2022	35.881
2023	36.192