Year	current US$
1992	4142200000
1993	2200000000
1994	1827980000
1995	1822200000
1996	1114990000
1997	1927900000
1998	1762300000
1999	1206800000
2000	1604900000
2001	895500000
2002	111830000
2003	104040000
2004	274000000
2005	248600000
2006	869000000
2007	420000000
2008	512750000
2009	344250000
2010	322910000
2011	564600000
2012	593000000
2013	1039000000
2015	120000000
2017	1091100000
2018	1151820000
2019	1408000000
2022	345000000