Year	Percent of total labor force
1980	11.011
1981	13.755
1982	15.77
1983	17.215
1984	19.937
1985	21.305
1986	20.907
1987	20.223
1988	19.238
1989	17.24
1990	16.238
1991	16.313
1992	18.353
1993	22.64
1994	24.118
1995	22.9
1996	22.08
1997	20.61
1998	18.605
1999	15.64
2000	13.857
2001	10.54
2002	11.45
2003	11.485
2004	10.965
2005	9.153
2006	8.453
2007	8.233
2008	11.245
2009	17.855
2010	19.858
2011	21.39
2012	24.788
2013	26.095
2014	24.443
2015	22.058
2016	19.635
2017	17.225
2018	15.255
2019	14.249
2020	14.057
2021	13.938
2022	13.858
2023	13.807
2024	13.777