Year	% of total labor force
1991	3.9999264270560806
1992	3.768443623740378
1993	3.660597349815361
1994	3.4808642576957665
1995	4.489265056787651
1996	4.6839799363732295
1997	4.6277138717165025
1998	4.450679080938493
1999	4.2740634384656095
2000	4.155094047047214
2001	3.8742838049048256
2002	3.8095841384209175
2003	3.711539910364611
2004	3.19328860832863
2005	3.285432576206985
2006	3.531389323036851
2007	3.2926580579495393
2008	3.4851589070278943
2009	3.476615859116349
2010	3.4848480006765907
2011	3.2414497488001732
2012	3.1560653424336795
2013	2.5176795146478885
2014	2.50432245274824
2015	2.5178520493222285
2016	2.490148863872745
2017	2.424655292301466
2018	2.5773536179742833
2019	2.596365315169808
2020	2.7132452819674375