Year	% of total labor force (national estimate)
1982	6.06
1991	5.93
1992	5.35
1993	5.88
1994	5.7
1995	5.4
1996	5.78
2003	8.22
2004	4.7
2005	3.886
2008	8.94
2009	8.72
2010	8.91
2011	4.406
2012	9
2014	6.17
2016	4.32