Year	% (modeled ILO estimate)
1991	40.392
1992	40.516
1993	40.609
1994	40.442
1995	39.969
1996	39.211
1997	38.223
1998	37.209
1999	36.339
2000	35.651
2001	35.104
2002	34.546
2003	34.1
2004	33.773
2005	33.517
2006	33.013
2007	32.482
2008	32.022
2009	31.615
2010	31.205
2011	30.893
2012	30.477
2013	30.08
2014	29.729
2015	29.38
2016	29.245
2017	28.967
2018	28.684
2019	28.417
2020	26.504
2021	27.032
2022	28.566
2023	29.163