Year	current US$
2003	0.4540005128837686
2004	1.0488553823767117
2005	0.8358769143385307
2006	1.1407719843454005
2007	1.682510218939948
2008	1.0613240720659958
2009	1.518496419279919
2010	0.9896903761317157
2011	1.1065164908478577
2012	1.1238835367677722
2013	1.0969608734602714
2014	1.8861106567286583
2015	1.307351826940488
2016	1.447799656187973
2017	1.087780275149716
2018	0.9503614503535713
2019	1.5850815079495755
2020	2.442001132509526
2021	3.432343419074792