Year	current US$
1994	3588070000
1995	5467680000
1996	8044090000
1997	21713076000
1998	18552630000
1999	8668340000
2000	13972000000
2001	6066740000
2002	7511460000
2003	7187810000
2004	3481000000
2005	4849090000
2006	9244600000
2007	10458300000
2008	11433350000
2010	16017226000
2011	20922000000
2012	36238430000
2013	18837820000
2014	18452840000
2015	11873970000
2016	21280500000
2017	16739400000
2018	10465260000
2019	21036780000
2020	11002660000
2021	3687940000