Year	Percent of total labor force
1997	12.26
1998	12.8
1999	13.3
2000	12.1
2001	12.2
2002	14.47
2003	16
2004	19.53
2005	21.83
2006	21.56
2007	18.8
2008	14.4
2009	16.9
2010	20
2011	23.6
2012	24.6
2013	23
2014	19.894
2015	18.231
2016	15.917
2017	14.051
2018	13.742
2019	13.449
2020	13.16
2021	12.875
2022	12.595
2023	12.319
2024	11.984