Year	current US$
2001	873259792.357793
2002	1166826133.94912
2003	1250560117.08457
2004	1414750029.60715
2005	2231963877.35963
2006	2704518141.87738
2007	2657780549.81727
2008	4621288830.10756
2009	2550315695.36669
2010	4481072877.45628
2011	6383626753.65513
2012	7076947279.17445
2013	6892572660.6249
2014	6411760699.9828
2015	4726978191.46494
2016	4392603463.64523
2017	4414708818.85285
2018	4136514595.42955
2019	4258768329.08412
2020	3851825631.01003
2021	3389928505.09106