Year	current US$
2000	138000000
2001	144000000
2002	198000000
2003	97000000
2004	137000000
2005	166000000
2006	281000000
2007	504000000
2008	630000000
2012	368000000
2013	645000000
2014	1056000000
2015	459000000
2016	684000000
2017	513000000
2018	575000000
2019	941000000
2020	377000000