Year	US Dollars
1980	272486335.89812
1981	385638031.91489
1982	444947074.46809
1983	139361170.21277
1984	103191489.3617
1985	435638563.82979
1986	424202127.65957
1987	507712765.95745
1988	660638297.87234
1989	425531914.89362
1990	886169680.85106
1991	-490957712.76596
1992	-587234042.55319
1993	163563829.78723
1994	401329787.23404
1995	673670212.76596
1996	714627393.61702
1997	607713031.91489
1998	44414627.65957
1999	1052925531.91489
2000	2043882978.7234
2001	1812765957.44681
2002	1331914893.61702
2003	1775797872.34043
2004	2166223404.25532
2005	3109840425.53191
2006	4103191489.3617
2007	4688031914.89362
2008	4955053191.48936
2009	4350797872.34042
2010	4783244680.85107
2011	7101063829.78724
2012	5659574468.08511
2013	5771276595.74468
2014	5521276595.74468
2015	3351063829.78723
2016	2694148936.17021