Year	Percent of total labor force (Units)
1984	5.361
1985	5.976
1986	8.037
1987	8.391
1988	8.805
1989	10.282
1990	16.800
1991	18.800
1992	17.600
1993	19.600
1994	15.800
1995	15.400
1996	13.100
1997	14.400
1998	13.500
1999	14.380
2000	13.706
2001	14.691
2002	15.325
2003	14.439
2004	14.700
2005	14.844
2006	14.058
2007	12.700
2008	12.650
2009	12.850
2010	12.475
2011	12.875
2012	12.150
2013	12.600
2014	11.875
2015	13.075
2016	15.275
2017	18.300
2018	18.600
2019	19.075
2020	22.700
2021	24.075
2022	22.850