Year	% of total labor force (national estimate)
1993	9.78
1994	11.1
1995	12.48
1996	13.82
1997	12.68
1998	14.31
1999	12.84
2001	9.07
2002	10.04
2005	10.91
2006	9.39
2007	8.51
2008	8.18
2013	8.349
2014	8.244
2015	7.578
2016	7
2017	6.596
2019	9.053
2021	10.157