Year	% (modeled ILO estimate)
1991	54.452
1992	53.053
1993	52.576
1994	50.642
1995	47.209
1996	46.979
1997	47.469
1998	43.716
1999	40.383
2000	40.854
2001	38.399
2002	36.281
2003	36.266
2004	37.188
2005	37.024
2006	36.233
2007	36.342
2008	34.708
2009	32.316
2010	30.344
2011	31.796
2012	32.329
2013	33.477
2014	33.807
2015	34.616
2016	35.094
2017	34.591
2018	35.231
2019	34.991
2020	29.148
2021	29.107
2022	27.614
2023	27.718