Year	% of total labor force
1991	0.2861953113109289
1992	0.22516886628009122
1993	0.219011892115203
1994	0.22422832452756006
1995	0.24306054638210378
1996	0.23648859190711088
1997	0.27641444176075586
1998	0.2691091448594155
1999	0.30376803919763984
2000	0.25425028288029716
2001	0.3731671997610056
2002	0.36362965744455034
2003	0.3545211362629929
2004	0.34460202041887583
2005	0.33817431617319926
2006	0.3316717669731491
2007	0.32330172646514604
2008	0.3151368884613056
2009	0.30712069570344974
2010	0.2991498438428582
2011	0.29110886673762054
2012	0.2848171568791888
2013	0.2787204138495761
2014	0.2721314834507018
2015	0.328079339557917
2016	0.3202340834293689
2017	0.33566343080874467
2018	0.339410082750309
2019	0.3309906910575043
2020	0.3249181759868741