Year	current US$
1998	295000000
1999	301000000
2000	290000000
2001	361000000
2002	373000000
2003	312000000
2004	336000000
2005	223000000
2006	211000000
2007	395000000
2008	477000000
2009	479000000
2010	521000000
2011	603000000
2012	647000000
2013	630000000
2014	514000000
2015	606000000
2016	620000000
2017	813000000
2018	826000000
2019	914000000
2020	567000000