Year	% (modeled ILO estimate)
1991	31.888
1992	30.468
1993	28.725
1994	28.993
1995	29.445
1996	30.409
1997	31.049
1998	31.666
1999	32.096
2000	33.166
2001	34.402
2002	35
2003	35.9
2004	36.986
2005	38.108
2006	39.284
2007	40.101
2008	40.393
2009	41.532
2010	40.727
2011	40.171
2012	40.34
2013	40.541
2014	40.688
2015	41.251
2016	41.288
2017	41.531
2018	41.516
2019	41.578
2020	38.824
2021	39.837
2022	40.759
2023	41.236