Year	US Dollars
1991	380621905.6458
1992	926156209.27239
1993	741502099.98344
1994	-8899299.75151
1995	-5800115.07347
1996	-19699969.30632
1997	-633550028.43708
1998	-993999990.49044
1999	-670400023.28409
2000	423000014.50637
2001	160001470.58823
2002	697992109.67551
2003	340506842.42302
2004	145000000
2005	1398000000
2006	3923000000
2007	4647000000
2008	4564000000
2009	5934000000
2010	7190574210.52632
2011	9110506070.17544
2012	10150117333.3333