Year	Percent of total labor force
1980	15.789
1981	15.385
1982	15
1983	14.286
1984	16.536
1985	16.901
1986	18.356
1987	20.056
1988	21.801
1989	18.1
1990	19.757
1991	20.263
1992	21.368
1993	23.152
1994	24.362
1995	28.105
1996	27.986
1997	27.961
1998	28.021
1999	29.293
2000	29.496
2001	27.306
2002	25.664
2003	23.716
2004	17.656
2005	15.265
2006	12.512
2007	13.793
2008	11.343
2009	10.167
2010	9.961
2011	9.971
2012	10.969
2013	9.829
2014	10.6
2015	11.214
2016	10.498
2017	11.709
2018	11.731
2019	12.575
2020	13.677
2021	14.957
2022	16.384
2023	18.12
2024	19.847