Year	% (modeled ILO estimate)
1991	31.339
1992	31.37
1993	31.422
1994	31.464
1995	31.489
1996	31.514
1997	31.553
1998	31.604
1999	31.658
2000	31.701
2001	31.729
2002	31.75
2003	31.765
2004	31.803
2005	31.747
2006	31.674
2007	31.572
2008	31.452
2009	31.399
2010	31.237
2011	31.081
2012	30.933
2013	30.798
2014	30.678
2015	30.571
2016	30.481
2017	30.293
2018	30.082
2019	29.87
2020	29.557
2021	29.218
2022	28.775
2023	28.876