Year	% of total labor force
1991	1.7023008676816669
1992	1.5227122686281005
1993	1.316624490795478
1994	1.199190945841872
1995	9.662676712822977
1996	10.455572954430519
1997	10.117745558746012
1998	9.126623226982314
1999	8.80528951351656
2000	8.713139065184736
2002	2.4385971400945605
2003	2.4471850406966875
2004	0.48749441412650485
2005	0.46668048271355
2006	0.8403509503298212
2007	0.8338932135971684
2008	1.5136327588774965
2009	3.931710654260205
2010	4.552883267664273
2011	4.7965953263249155
2012	4.496158354125489
2013	4.19523173500904
2014	3.72705501582188
2015	3.700732406690331
2016	3.623538777137557
2017	3.4901588865118107
2018	2.9525937221300955
2019	3.01507875591777
2020	1.8120452246952552