Year	% (modeled ILO estimate)
1991	51.723
1992	46.059
1993	41.75
1994	38.609
1995	36.211
1996	35.095
1997	37.914
1998	42.618
1999	42.078
2000	41.094
2001	42.375
2002	42.193
2003	38.798
2004	36.647
2005	35.286
2006	34.773
2007	34.406
2008	34.08
2009	30.841
2010	27.9
2011	26.604
2012	23.019
2013	21.663
2014	22.377
2015	22.812
2016	23.896
2017	25.867
2018	27.248
2019	28.021
2020	23.357
2021	22.775
2022	25.19
2023	28.873