Year	% (modeled ILO estimate)
1991	52.306
1992	48.064
1993	46.018
1994	46.913
1995	49.895
1996	49.129
1997	53.165
1998	60.425
1999	64.962
2000	68.177
2001	66.048
2002	61.496
2003	61.718
2004	60.898
2005	65.346
2006	68.23
2007	66.834
2008	58.507
2009	42.914
2010	36.511
2011	34.2
2012	32.481
2013	35.975
2014	36.854
2015	38.303
2016	42.224
2017	40.167
2018	41.208
2019	41.359
2020	37.512
2021	43.088
2022	48.014
2023	48.431