Year	% (modeled ILO estimate)
1991	19.659
1992	19.74
1993	19.765
1994	19.27
1995	19.529
1996	18.981
1997	18.963
1998	18.661
1999	18.518
2000	18.402
2001	18.077
2002	17.824
2003	18.024
2004	18.346
2005	18.375
2006	18.433
2007	18.708
2008	18.056
2009	17.409
2010	16.237
2011	15.376
2012	14.186
2013	14.255
2014	15.008
2015	13.793
2016	11.998
2017	11.522
2018	11.128
2019	10.785
2020	9.33
2021	9.44
2022	9.525
2023	9.628