Year	Percent of total labor force
1996	31.992
1997	36.104
1998	34.481
1999	32.411
2000	31.727
2001	30.515
2002	31.944
2003	36.687
2004	37.15
2005	37.25
2006	36.025
2007	34.925
2008	33.775
2009	32.175
2010	32.05
2011	31.375
2012	31
2013	29
2014	28.025
2015	26.05
2016	23.75
2017	22.375
2018	19.4
2019	18.886
2020	18.423
2021	17.902
2022	17.369
2023	16.834
2024	16.298