Year	% (modeled ILO estimate)
1991	22.633
1992	22.73
1993	22.761
1994	22.525
1995	22.253
1996	22.824
1997	23.404
1998	23.995
1999	24.596
2000	25.207
2001	25.828
2002	26.459
2003	27.1
2004	27.75
2005	28.41
2006	28.654
2007	28.899
2008	29.145
2009	29.393
2010	29.642
2011	29.892
2012	30.143
2013	30.396
2014	30.649
2015	30.904
2016	31.16
2017	33.92
2018	36.59
2019	30.61
2020	29.72
2021	28.41
2022	28.137
2023	29.423