Year	% (modeled ILO estimate)
1991	40.596
1992	39.891
1993	37.936
1994	39.432
1995	38.348
1996	37.337
1997	36.103
1998	35.851
1999	34.299
2000	33.58
2001	31.401
2002	29.159
2003	27.592
2004	25.374
2005	23.265
2006	23.72
2007	23.926
2008	23.548
2009	21.758
2010	20.604
2011	19.79
2012	20.984
2013	20.99
2014	21.605
2015	23.4
2016	23.223
2017	24.268
2018	24.362
2019	24.315
2020	19.475
2021	19.98
2022	21.448
2023	21.784