Year	% (modeled ILO estimate)
1991	50.418
1992	51.426
1993	47.913
1994	44.431
1995	41.008
1996	37.662
1997	34.453
1998	31.33
1999	28.361
2000	25.533
2001	32.405
2002	28.556
2003	25.751
2004	25.669
2005	24.631
2006	26.538
2007	26.138
2008	26.349
2009	25.085
2010	26.705
2011	24.903
2012	25.404
2013	24.793
2014	22.731
2015	21.257
2016	19.635
2017	21.905
2018	19.348
2019	20.078
2020	18.254
2021	15.508
2022	18.046
2023	19.16