Year	% (national estimate)
1991	38.88
1994	34.46
1997	35.1
1998	34.9
1999	31.24
2000	31.3
2001	35
2002	28.32
2003	29.74
2005	27.49
2006	29.202
2007	27.583
2008	28.1
2009	26.194
2010	22.919
2011	23.854
2012	26.235
2013	27.117
2014	25.307
2015	25.342
2016	23.265
2017	23.559
2018	22.841
2019	25.831
2020	23.359
2021	21.175
2022	20.481