Year	US Dollars
1980	995769230.76923
1981	221714285.71429
1982	206266666.66667
1983	34555555.55555
1984	331666666.66667
1985	-69842105.26316
1986	-695823529.41177
1987	-516230769.23077
1988	-74529411.76471
1989	-382111111.11111
1990	-744545454.54545
1991	467741935.48387
1992	-603092783.50515
1993	-826086956.52174
1994	-60608856.08856
1995	263214285.71429
1996	1373670601.4615
1997	1435844580.53392
1998	1027722108.61168
1999	-623502748.00022
2000	-703087646.58786
2001	-1321722433.28603
2002	-1308127587.86712
2003	-2152557857.67877
2004	-2916766554.50448
2005	-4377367384.5372
2006	-5876095683.96075
2007	-8363361091.6725
2008	-10750224349.3868
2009	-4294519087.22542
2010	-1442124001.62448
2011	215985780.30573
2012	-1710183311.43234
2013	-228490092.29099
2014	-535036630.03663
2015	74161754.70415
2016	2296549773.75566
2017	869490060.50129