Year	current US$
2001	475000000
2002	444000000
2003	547000000
2004	797000000
2005	991000000
2006	1366000000
2007	2032000000
2008	3232000000
2009	2766000000
2010	3476000000
2011	4441000000
2012	5298000000
2013	6051000000
2014	4955000000
2015	3500000000
2016	3702000000
2017	4526000000
2018	4520000000
2019	4459000000
2020	1660000000