Year	current US$
1992	137000000
1994	595500000
1995	2470000000
1996	3203600000
1997	2725000000
1998	330000000
1999	125000000
2003	530000000
2004	128000000
2005	32000000
2006	429500000
2007	423200000
2008	2885200000
2010	2300000000
2011	366000000
2012	1901000000
2013	1936700000
2014	1690500000
2015	191000000
2016	8068800000
2017	8839500000
2018	3420100000
2019	290000000
2021	150000000