Year	% (modeled ILO estimate)
1991	31.362
1992	31.209
1993	31.097
1994	31.046
1995	30.76
1996	30.551
1997	30.382
1998	30.045
1999	29.644
2000	29.182
2001	28.645
2002	28.064
2003	27.497
2004	27.194
2005	26.843
2006	26.512
2007	26.01
2008	25.847
2009	25.634
2010	25.456
2011	25.251
2012	25.103
2013	25.007
2014	24.84
2015	23.645
2016	22.575
2017	20.461
2018	20.144
2019	19.558
2020	17.055
2021	17.145
2022	17.962
2023	18.056