Year	US Dollars
1960	42839816000
1961	-756246.52674
1962	1728995.31522
1963	2640581.73327
1964	12812220.86358
1965	13466038.60248
1966	407076.83345
1967	0
1968	-2423568.52625
1969	1923368.57713
1970	37987991.42783
1971	53384983.87492
1972	3571314.81601
1973	8524505.20018
1974	220602286.28346
1975	34995560.17421
1976	-15484378.93526
1977	9361783.35353
1978	354522146.76385
1979	638863057.2654
1980	1416133233.58585
1981	875496736.82314
1982	793350698.16459
1983	603045084.77676
1984	672835599.08579
1985	176733909.95948
1986	-664152697.48298
1987	-82851816.10195
1988	-194058571.94347
1989	192471481.45852
1990	903532189.55806
1991	755975481.98927
1992	686872186.82256
1993	623790118.84502
1994	981682374.26664
1995	1172236553.29758
1996	1688601206.83629
1997	1282258415.46602
1998	-52100866.54537
1999	1002242816.33675
2000	1842798699.90054
2001	1250294493.39973
2002	1086435896.6192
2003	1530522265.7318
2004	2195866699.17438
2005	3454919833.06668
2006	3352891936.56564
2007	3971103360.38299
2008	5490120371.50967
2009	2514261849.61317
2010	3757493281.5374
2011	5999795280.90702
2012	5075538595.30669
2013	4235891830.621
2014	2821718596.72542
2015	2590584656.84729
2016	2395408505.26003
2017	2484304097.65011