Year	current US$
2003	0.4540005128837686
2004	1.0488553823767117
2005	0.8358769143385308
2006	1.1407719843454005
2007	1.6825102189399477
2008	1.0613240720659958
2009	1.518496419279919
2010	0.9896903761317157
2011	1.1065164908478575
2012	1.1238835367677722
2013	1.0969608734602712
2014	1.886110656728658
2015	1.3073518269404876
2016	1.447799656187973
2017	1.0877802751497163
2018	0.9503614503535713
2019	1.585081507949575
2020	2.4420011325095263
2021	3.432343419074792