Year	% (modeled ILO estimate)
1991	41.207
1992	36.782
1993	36.189
1994	38.954
1995	33.162
1996	32.355
1997	29.939
1998	30.826
1999	24.153
2000	25.122
2001	21.791
2002	19.556
2003	20.269
2004	24.716
2005	26.591
2006	25.779
2007	29.805
2008	32.878
2009	26.587
2010	24.042
2011	28.821
2012	30.281
2013	30.551
2014	33.284
2015	33.096
2016	35.997
2017	38.133
2018	39.908
2019	37.963
2020	33.556
2021	34.035
2022	40.446
2023	39.087