Year	% (modeled ILO estimate)
1991	52.176
1992	51.655
1993	51.328
1994	50.962
1995	50.422
1996	50.22
1997	50.027
1998	49.838
1999	49.649
2000	49.458
2001	46.482
2002	46.192
2003	47.579
2004	45.445
2005	44.133
2006	43.381
2007	40.865
2008	38.634
2009	37.813
2010	39.02
2011	38.547
2012	38.826
2013	39.278
2014	40.073
2015	41.799
2016	40.988
2017	40.702
2018	41.471
2019	39.918
2020	34.721
2021	29.97
2022	32.304
2023	33.836