Year	% (modeled ILO estimate)
1991	40.795
1992	39.999
1993	39.127
1994	38.69
1995	37.852
1996	37.356
1997	36.934
1998	36.157
1999	35.496
2000	35.491
2001	35.302
2002	35.035
2003	34.539
2004	34.369
2005	34.082
2006	33.665
2007	33.237
2008	32.24
2009	29.912
2010	29.034
2011	26.77
2012	23.375
2013	21.656
2014	20.688
2015	19.859
2016	19.31
2017	18.522
2018	18.05
2019	17.348
2020	17.001
2021	17.115
2022	17.407
2023	17.38