Year	current US$
1996	43500000
1997	486300000
1998	832600000
1999	306300000
2000	1469000000
2001	311000000
2002	2124000000
2003	1285000000
2004	695000000
2005	120000000
2006	801000000
2007	120000000
2008	562000000
2010	799700000
2011	1207000000
2012	2129500000
2013	2117600000
2014	4502040000
2015	2544900000
2016	3586600000
2017	5795800000
2018	3485650000
2019	2467210000
2020	4211500000
2021	448460000