Year	US Dollars
1990	-191163152.96614
1991	24372312.31081
1992	-54887152.27053
1993	-215495944.76356
1994	-155901403.23254
1995	-78200984.88436
1996	-36099830.79526
1997	-61379868.39765
1998	-120057944.88797
1999	-15560187.42931
2000	-18507248.47084
2001	-112078113.14392
2002	-129817191.85268
2003	-157164728.55556
2004	-240726645.3459
2005	-596739427.58134
2006	-961304086.82998
2007	-1788093071.89542
2008	-2838323840.61562
2009	-1958453279.26232
2010	-2461014204.1562
2011	-3058498438.24563
2012	-3691847141.01779
2013	-4292702720.28882
2014	-3306949509.88335
2015	-2496657477.56811
2016	-2050297471.82766
2017	-1799376738.36509