Year	% (modeled ILO estimate)
1991	39.179
1992	39.333
1993	39.401
1994	39.405
1995	39.252
1996	39.527
1997	39.609
1998	39.567
1999	39.437
2000	39.303
2001	39.497
2002	39.656
2003	39.79
2004	39.89
2005	39.946
2006	38.864
2007	37.795
2008	36.74
2009	35.7
2010	34.678
2011	33.675
2012	32.688
2013	32.792
2014	32.82
2015	32.752
2016	32.749
2017	32.631
2018	32.422
2019	32.12
2020	31.811
2021	31.804
2022	31.146
2023	31.274