Year	% of total labor force
1991	4.142649803027162
1992	3.8600506245171764
1993	3.741896734167341
1994	3.576237142359002
1995	4.4796460092568395
1996	4.62552598697482
1997	4.557635945499349
1998	4.387162941109269
1999	4.213559228211645
2000	4.124246570164118
2001	3.854440573563258
2002	3.7493775055311835
2003	3.658897809574694
2004	3.1981612047997885
2005	3.2870268278979298
2006	3.48278991217326
2007	3.238217330367899
2008	3.3498318157933227
2009	3.3103945631612324
2010	3.2784441260409385
2011	3.056516885768132
2012	2.9618001965637877
2013	2.427006761444469
2014	2.4008198976916293
2015	2.392466343408757
2016	2.361146400904181
2017	2.302627233074346
2018	2.4049754506989487
2019	2.3835800387718318
2020	2.4923670338597805