Year	% (modeled ILO estimate)
1991	54.183
1992	54.155
1993	54.386
1994	54.653
1995	54.968
1996	55.302
1997	55.692
1998	56.103
1999	56.566
2000	57.066
2001	57.612
2002	58.19
2003	56.84
2004	55.501
2005	54.146
2006	52.823
2007	51.523
2008	50.253
2009	48.928
2010	47.568
2011	44.948
2012	43.144
2013	41.407
2014	39.632
2015	37.734
2016	35.857
2017	34.085
2018	32.454
2019	32.325
2020	31.768
2021	31.701
2022	31.63
2023	31.75