Year	% (modeled ILO estimate)
1991	50.385
1992	46.462
1993	45.93
1994	43.835
1995	43.751
1996	43.207
1997	42.639
1998	43.612
1999	42.307
2000	42.069
2001	40.004
2002	39.497
2003	38.966
2004	41.242
2005	38.687
2006	37.519
2007	35.908
2008	35.667
2009	33.726
2010	32.748
2011	31.156
2012	32.824
2013	30.625
2014	30.922
2015	30.392
2016	30.171
2017	29.906
2018	29.881
2019	29.759
2020	28.428
2021	29.306
2022	30.071
2023	30.956