Year	current US$
1996	6516500000
1997	8189300000
1998	6295100000
1999	3747750000
2001	3552800000
2003	2428720000
2005	4700110000
2006	7897180000
2007	12603940000
2008	15382430000
2009	27212430000
2010	39954940000
2011	27160697000
2012	25438750000
2013	8898160000
2014	13558935000
2015	12748820000
2016	8618450000
2017	20329810000
2018	9926020000
2019	10303620000
2020	15239240000
2021	10575140000
2022	11963630000