Year	US Dollars
1980	341836671.80277
1981	-256443140.38286
1982	-181594584.63805
1983	-174755407.95261
1984	-120547210.7368
1985	184966168.61848
1986	186929452.95405
1987	-112890422.39686
1988	37511018.25379
1989	85172417.73745
1990	-185204924.0521
1991	-175932459.34886
1992	-203840638.14867
1993	-93907060.01163
1994	-47023741.12876
1995	-166433100.82435
1996	-228777987.11418
1997	-313662586.80556
1998	-363707360.30968
1999	-318746787.78951
2000	-143552047.60944
2001	-230238291.59504
2002	-69576726.40337
2003	-447992914.45794
2004	-149789572.27116
2005	9941550.17062
2006	311842457.35805
2007	-466340917.47807
2008	-1060736987.36261
2009	-1844830829.50777
2010	-1455281320.00219
2011	-1482807618.68036
2012	-2179374056.02923
2013	-2144833507.67988
2014	-3160026564.81797
2015	-3565869949.60381
2016	-2581681014.0868
2017	-1433233345.10137