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	3.3205189089623337
2006	3.5629092674010745
2007	3.3233355396279975
2008	3.5133924405226766
2009	3.5030297203536302
2010	3.5097518988392924
2011	3.2663381616691436
2012	3.179857494149181
2013	2.5176795146478885
2014	2.50432245274824
2015	2.5178520493222285
2016	2.490148863872745
2017	2.424655292301466
2018	2.5773536179742833
2019	2.5681809470096
2020	2.6851206949994655