Year	% (modeled ILO estimate)
1991	55.345
1992	54.319
1993	52.935
1994	52.527
1995	52.986
1996	52.36
1997	52.938
1998	53.572
1999	53.558
2000	54.05
2001	52.092
2002	50.072
2003	48.084
2004	46.073
2005	44.081
2006	42.08
2007	40.104
2008	38.104
2009	36.171
2010	34.281
2011	33.761
2012	33.592
2013	33.452
2014	32.8
2015	32.517
2016	32.299
2017	32.153
2018	32.264
2019	32.008
2020	31.466
2021	31.062
2022	30.963
2023	30.828