Year	% (modeled ILO estimate)
1991	56.541
1992	56.929
1993	55.541
1994	55.214
1995	54.546
1996	53.882
1997	51.896
1998	49.749
1999	45.585
2000	42.788
2001	40.364
2002	37.952
2003	35.091
2004	31.543
2005	31.215
2006	31.444
2007	32.823
2008	32.36
2009	31.076
2010	29.587
2011	29.028
2012	29.155
2013	29.936
2014	32.326
2015	33.122
2016	33.729
2017	33.75
2018	32.153
2019	31.548
2020	30.474
2021	29.44
2022	29.794
2023	29.641