Year	% (modeled ILO estimate)
1991	40.663
1992	42.009
1993	42.519
1994	42.348
1995	41.672
1996	41.495
1997	41.121
1998	40.818
1999	40.551
2000	40.519
2001	40.275
2002	39.827
2003	39.129
2004	38.459
2005	37.794
2006	37.134
2007	36.479
2008	33.582
2009	31.942
2010	31.8
2011	32.585
2012	32.192
2013	31.801
2014	30.588
2015	29.316
2016	27.882
2017	26.889
2018	28.864
2019	34.85
2020	33.387
2021	28.366
2022	30.401
2023	30.839