Year	Percent of total labor force
1980	7.37
1981	7.649
1982	8.288
1983	7.367
1984	7.833
1985	8.167
1986	8.867
1987	9.617
1988	9.683
1989	9.667
1990	8.858
1991	8.533
1992	8.808
1993	9.833
1994	10.633
1995	11.15
1996	11.15
1997	11.242
1998	11.333
1999	10.942
2000	10.1
2001	9.1
2002	8.608
2003	8.45
2004	7.975
2005	7.692
2006	6.792
2007	6.125
2008	6.733
2009	7.742
2010	8.35
2011	8.408
2012	10.675
2013	12.142
2014	12.608
2015	11.908
2016	11.667
2017	11.258
2018	10.633
2019	10.733
2020	10.533
2021	10.383
2022	10.283
2023	10.183
2024	10.083