Year	% (modeled ILO estimate)
1991	39.861
1992	40.075
1993	40.876
1994	40.652
1995	40.474
1996	38.542
1997	37.692
1998	36.28
1999	36.593
2000	37.066
2001	37.51
2002	38.749
2003	37.881
2004	39.645
2005	40.035
2006	40.057
2007	40.874
2008	41.206
2009	39.528
2010	39.203
2011	38.692
2012	38.944
2013	38.292
2014	38.126
2015	35.928
2016	33.215
2017	33.088
2018	33.561
2019	34.616
2020	28.835
2021	32.372
2022	37.774
2023	38.546