Year	% of total labor force (modeled ILO estimate)
1991	29.933
1992	30.128
1993	30.401
1994	30.366
1995	30.178
1996	29.837
1997	29.844
1998	29.936
1999	30.191
2000	30.249
2001	30.308
2002	30.277
2003	30.318
2004	30.315
2005	30.31
2006	24.843
2007	19.4
2008	17.15
2009	19.09
2010	19.649
2011	19.759
2012	19.808
2013	19.585
2014	18.054
2015	17.555
2016	17.732
2017	16.082
2018	15.19
2019	15.128
2020	17.878
2021	16.543
2022	15.288
2023	15.254