Year	US Dollars
1990	-1050897409.85272
1991	-354372357.52256
1992	-502302238.3232
1993	-744515577.4186
1994	1039453197.29505
1995	548507189.54248
1996	-2962955640.0507
1997	-2601754843.09505
1998	-3164205168.36335
1999	-1338089708.07586
2000	-747667219.45826
2001	-2464246085.01119
2002	-2537018633.54037
2003	-886643340.85779
2004	-1566599205.36379
2005	-2876653401.31824
2006	-2808211014.92912
2007	-966026553.51766
2008	-2839444851.32562
2009	-1319085857.18255
2010	-1300041802.03196
2011	-897185356.97337
2012	3424901599.0381
2013	4169118661.3413
2014	3459605496.99285
2015	1406384291.56378
2016	3143795978.86163
2017	3281502662.47631