Year	% (modeled ILO estimate)
1991	37.734
1992	36.102
1993	35.234
1994	36.56
1995	40.138
1996	46.383
1997	43.207
1998	46.19
1999	46.816
2000	47.122
2001	45.206
2002	44.606
2003	42.312
2004	44.649
2005	44.893
2006	44.813
2007	46.041
2008	44.555
2009	41.525
2010	40.105
2011	38.816
2012	33.652
2013	33.543
2014	31.128
2015	30.229
2016	32.336
2017	30.607
2018	33.577
2019	33.072
2020	29.798
2021	31.068
2022	31.476
2023	31.966