Year	current US$
1997	313700000
1998	225000000
1999	16149999.999999998
2000	18500000
2001	483000000
2006	40500000
2007	25400000
2008	177400000
2009	88530000
2010	137130000
2011	324507000
2012	1527800000
2013	40300000
2014	516500000
2015	300000000
2016	170000000
2017	438000000
2018	269000000
2019	35710000
2020	2087000000
2022	613000000