Year	% of total labor force (modeled ILO estimate)
1991	0.6
1992	3.1
1993	8.5
1994	12.8
1995	17.7
1996	24.4
1997	17.1
1998	14
1999	12.8
2000	12.171
2001	11.523
2002	10.837
2003	10.155
2004	9.443
2005	8.748
2006	8.064
2007	7.408
2008	6.735
2009	6.1
2010	6.054
2011	6.024
2012	5.97
2013	5.946
2014	5.911
2015	5.881
2016	5.844
2017	5.648
2018	4.763
2019	4.165
2020	4.049
2021	3.9
2022	3.574
2023	3.574