Year	% (modeled ILO estimate)
1991	21.59
1992	21.981
1993	22.871
1994	24.242
1995	26.082
1996	27.451
1997	27.995
1998	27.772
1999	27.994
2000	30.444
2001	30.662
2002	30.681
2003	31.813
2004	34.424
2005	35.32
2006	40.07
2007	39.134
2008	38.812
2009	35.642
2010	33.523
2011	30.978
2012	33.778
2013	35.212
2014	34.349
2015	33.592
2016	32.738
2017	31.048
2018	29.409
2019	27.885
2020	23.699
2021	27.274
2022	27.457
2023	27.367