Year	% of total labor force
1991	3.455619052555646
1992	2.9186124082721814
1993	2.8120581051549043
1994	3.0922296135099514
1995	7.430607415003139
1996	7.241801246445988
1997	7.13418076679612
1998	6.838666509229741
1999	6.6498559983902
2000	6.391934102777476
2001	6.132910586792256
2002	5.80305701711763
2003	5.608877752674701
2004	5.033388141337539
2005	4.548664208943974
2006	3.735223749732145
2007	3.4032431115672654
2008	3.1124988123359794
2009	2.9278259312698127
2010	2.809053640510422
2011	2.840490269204327
2012	2.7837779844074104
2013	2.6924790454290117
2014	2.6204801430625952
2015	2.5319947330345944
2016	2.426557966180316
2017	2.269808559567542
2018	2.2310042191543333
2019	2.1980361125764682
2020	2.2612721441025427