Year	% of total labor force (national estimate)
1985	3.2
1986	4.7
1987	5.8
1988	6
1989	8.66
2001	4.12
2003	7.6
2004	6.41
2005	5.37
2006	5.31
2007	4.89
2008	6.2
2009	8.16
2010	7.83
2012	5.208
2013	5.28
2014	4.52
2015	4.7
2016	3.9
2017	3.3
2018	5.2