Year	current US$
2002	512000000
2003	424000000
2004	428000000
2005	572000000
2006	442000000
2007	485000000
2008	773000000
2009	455000000
2010	660000000
2011	1041000000
2012	1139000000
2013	1183000000
2014	1306000000
2015	1293000000
2016	1360000000
2017	1552000000
2018	1489000000
2019	1494000000
2020	221000000