Year	current US$
2000	0.1683613802783876
2001	0.2860140346019928
2002	0.238738857820818
2003	0.26339048590702907
2004	0.37174294167538796
2005	0.4772058799461759
2006	0.49259056844238874
2007	0.55602498838244
2008	0.5305395276615734
2009	0.6538244407265733
2010	0.6608546361483074
2011	0.6837940211302088
2012	0.7371332718911079
2013	0.8997137872520217
2014	1.127045539488982
2015	0.6910329999713241
2016	0.8004810700940693
2017	0.6914407163352911
2018	0.48975797024042905
2019	0.6254726959129545
2020	0.5464043781358638
2021	1.9712984643771296