Year	% of total labor force
1991	6.277810223699304
1992	4.8891800667239735
1993	4.571341181633515
1994	4.687675787842044
1995	5.2244143505096385
1996	4.5280650161005545
1997	4.2419532413703775
1998	3.9636865795018705
1999	3.7005482461096224
2000	3.4824673597832008
2001	3.2547010705007704
2002	1.9156663656993245
2003	2.186222899494355
2004	2.0336313823487306
2005	1.9091013223708493
2006	1.6466879293900216
2007	1.3530963221515397
2008	1.119005340288427
2009	0.9624619096263365
2010	0.8970826345030294
2011	0.8819199154463605
2012	0.8674897500132676
2013	1.0546259409188503
2014	1.0385075295092738
2015	1.0234160849168938
2016	1.0089437256031801
2017	0.9954924732868285
2018	0.9836133144396307
2019	0.9722967949856647
2020	0.9704909143564875