Year	Percent of total labor force
1990	15.897
1991	14.665
1992	14.566
1993	13.777
1994	13.127
1995	12.267
1996	11.294
1997	10.501
1998	9.174
1999	8.857
2000	7.573
2001	7.9
2002	8.8
2003	8.4
2004	8.3
2005	7.7
2006	6.6
2007	6.2
2008	6
2009	5.9
2010	5
2011	4.1
2012	4
2013	4.4
2014	4.3
2015	4.7
2016	4.4
2017	4.4
2018	4.4
2019	4.4
2020	4.4
2021	4.4
2022	4.4
2023	4.4
2024	4.4