Year	current US$
2000	2.7187003839310067
2001	2.0461323890115053
2002	2.445551682278439
2003	2.6325393046879726
2004	3.527850756510564
2005	4.417855162093324
2006	5.976671143244905
2007	6.568149810025318
2008	7.269288626440285
2009	8.054291611131802
2010	8.487756562101557
2011	10.104895822696353
2012	10.167942092169673
2013	11.928746446856614
2014	11.837450022664228
2015	9.951781569650516
2016	9.399243241660848
2017	9.03938153807263
2018	9.436495388659825
2019	10.315932621927647
2020	9.359493997577463
2021	11.234541612117615