Year	% (modeled ILO estimate)
1991	40.487
1992	40.625
1993	40.634
1994	40.48
1995	40.279
1996	39.937
1997	39.618
1998	39.847
1999	39.701
2000	39.432
2001	39.375
2002	39.308
2003	39.092
2004	39.685
2005	39.242
2006	38.347
2007	38.193
2008	37.258
2009	37.456
2010	37.266
2011	38.93
2012	38.533
2013	37.896
2014	38.444
2015	36.943
2016	36.863
2017	34.323
2018	33.307
2019	32.395
2020	28.009
2021	28.526
2022	31.087
2023	31.8