Year	% (modeled ILO estimate)
1991	45.116
1992	44.873
1993	42.325
1994	41.631
1995	39.803
1996	39.085
1997	36.123
1998	35.402
1999	34.584
2000	37.571
2001	39.838
2002	37.79
2003	36.195
2004	35.188
2005	35.703
2006	34.18
2007	33.007
2008	33.11
2009	33.813
2010	34.555
2011	33.498
2012	33.551
2013	33.262
2014	33.821
2015	32.791
2016	34.491
2017	34.788
2018	35.072
2019	35.176
2020	31.824
2021	31.018
2022	31.078
2023	32.111