Year	% (modeled ILO estimate)
1991	44.491
1992	41.122
1993	37.807
1994	30.714
1995	31.044
1996	33.08
1997	32.619
1998	32.102
1999	29.006
2000	28.161
2001	26.539
2002	25.278
2003	25.414
2004	24.63
2005	23.014
2006	22.385
2007	24.155
2008	21.496
2009	18.655
2010	17.34
2011	15.019
2012	15.939
2013	16.214
2014	17.94
2015	18.02
2016	18.193
2017	21.129
2018	20.555
2019	17.833
2020	16.541
2021	15.586
2022	15.899
2023	17.541