Year	Percent of total labor force
1991	13.159
1992	15.253
1993	14.775
1994	14.48
1995	14.5
1996	9.952
1997	9.906
1998	11.637
1999	18.633
2000	20.592
2001	21.508
2002	21.783
2003	19.067
2004	17.783
2005	17.583
2006	16.525
2007	14.733
2008	13.033
2009	14.517
2010	17.167
2011	17.367
2012	18.6
2013	19.808
2014	19.275
2015	17.067
2016	14.958
2017	12.433
2018	10
2019	9
2020	8
2021	7
2022	7
2023	7
2024	7