Year	current US$
2002	782000000
2003	774000000
2004	937000000
2005	835000000
2006	752000000
2007	579000000
2008	459000000
2009	360000000
2010	405000000
2011	449000000
2012	478000000
2013	525000000
2014	560000000
2015	635000000
2016	998000000
2017	969000000
2018	754000000
2019	735000000
2020	536000000