Year	current US$
2000	0.1535178004731806
2001	0.2596918623837866
2002	0.21748543132851006
2003	0.23990544020050733
2004	0.3385384620943022
2005	0.4341472819672218
2006	0.44821794534609266
2007	0.5066674905872638
2008	0.4844786567707936
2009	0.5949774619291948
2010	0.6017208726254809
2011	0.6221876567935573
2012	0.6719081288290473
2013	0.8191197144323443
2014	1.0246734318760735
2015	0.6308407097313716
2016	0.7289654493847768
2017	0.6315675367353466
2018	0.4478616797696952
2019	0.571130693120288
2020	0.5009750644679593
2021	1.796699563661762