Year	US Dollars
1991	876176218.68397
1992	727943294.14117
1993	452142645.70315
1994	-113233163.23316
1995	497147252.70247
1996	239397902.57729
1997	100173564.87561
1998	710588338.85325
1999	709207872.85954
2000	704419808.68243
2001	731945746.76139
2002	1104419498.06342
2003	1002487415.04964
2004	1064100740.13571
2005	1065769900.06553
2006	1031273348.60578
2007	1356429849.43047
2008	827743285.59971
2009	1080158482.42362
2010	723422012.00875
2011	564380827.54987
2012	298727151.41017
2013	1373051056.10601
2014	712540656.84807
2015	217407146.55969
2016	610594772.92545
2017	-292570949.46385