Year	% of total labor force (national estimate)
1995	8.27
1996	7.61
1997	7.1
1998	6.23
1999	6.26
2000	5.45
2001	4.08
2002	3.31
2003	2.33
2004	1.854
2005	1.95
2006	1.913
2007	1.788
2008	1.583
2009	1.67
2010	2.5
2011	3.18
2012	3.46
2013	3.29
2014	2.7
2015	2.4
2016	2
2017	1.7
2018	1.7