Year	% (modeled ILO estimate)
1991	53.742
1992	54.884
1993	54.658
1994	54.107
1995	53.23
1996	49.949
1997	46.162
1998	44.944
1999	42.714
2000	41.324
2001	39.653
2002	37.364
2003	33.941
2004	36.081
2005	31.24
2006	30.559
2007	30.517
2008	30.406
2009	30.925
2010	31.214
2011	30.711
2012	30.54
2013	30.072
2014	29.564
2015	31.275
2016	28.036
2017	29.952
2018	29.504
2019	29.634
2020	29.733
2021	26.831
2022	25.498
2023	24.963