Year	Percent of total labor force
1998	3.25
1999	4.793
2000	6.923
2001	6.489
2002	8.131
2003	11.4
2004	9.5
2005	8.8
2006	9.3
2007	5.71
2008	6.9
2009	10.3
2010	10.6
2011	8.879
2012	9.607
2013	7.599
2014	7.451
2015	7.298
2016	7.694
2017	8.923