Year	current US$
1995	5527680000
1996	8065690000
1997	21713076000
1998	18625630000
1999	8823340000
2000	14002000000
2001	6066740000
2002	7511460000
2003	7197280000
2004	3541000000
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	11050510000