Year	% (modeled ILO estimate)
1991	49.173
1992	48.422
1993	47.676
1994	46.935
1995	46.197
1996	45.469
1997	44.753
1998	44.052
1999	42.999
2000	37.242
2001	32.968
2002	31.719
2003	32.251
2004	25.707
2005	25.133
2006	26.256
2007	27.027
2008	29.985
2009	29.291
2010	28.414
2011	28.132
2012	29.271
2013	31.491
2014	34.197
2015	33.828
2016	35.361
2017	35.064
2018	36.494
2019	37.333
2020	36.603
2021	36.309
2022	36.306
2023	34.001