Year	Percent of total labor force
2001	38.4
2002	35.3
2003	31.2
2004	31.6
2005	31.2
2006	27.8
2007	28.7
2008	16.4
2009	18.7
2010	19
2011	18.4
2012	17.3
2013	16.2
2014	17.6
2015	18.5
2016	20.201
2017	18.596
2018	18.136
2019	17.912
2020	17.705
2021	17.772
2022	17.672
2023	17.572
2024	17.472