Year	% of total labor force (national estimate)
1986	14.2
1991	11.1
1996	9.1
2002	12.8
2004	10.3
2005	11.813
2006	11.519
2007	10.772
2008	10.63
2009	12.113
2010	13.679
2011	12.491
2012	12.275
2013	10.595
2014	10.68
2015	11.166
2016	12.618
2017	12.232
2018	12.195
2019	10.74
2020	9.687
2021	9.282
2022	9.085