Year	US Dollars
1960	-1520000000
1961	-27159456.81086
1962	-24919501.60997
1963	-29819403.61193
1964	-17079658.40683
1965	-31639367.21266
1966	-41159176.81646
1967	-29273681.30351
1968	-37561502.4601
1969	-42841713.66855
1970	-43321732.86931
1971	-43928270.55001
1972	-59505988.02395
1973	-44184059.56304
1974	-60033285.78222
1975	-102801574.43853
1976	-56516976.9989
1977	-37324177.6498
1978	-170084153.135
1979	-186681356.34717
1980	-172761975.12622
1981	-72154585.05529
1982	-74940786.35718
1983	-92611508.34185
1984	23489458.04443
1985	-64568669.65273
1986	-25307613.7768
1987	-27889708.87853
1988	-127240112.4429
1989	-250262728.75521
1990	-181281798.52688
1991	-133000000
1992	-346399994.44953
1993	-333200031.79795
1994	-379504155.02953
1995	-247628650.13053
1996	-206454512.1991
1997	-325684210.84638
1998	-93391098.93894
1999	-271208321.51987
2000	-169666383.4018
2001	-191148916.92626
2002	-355851926.03865
2003	-336977191.67714
2004	-478649281.48386
2005	-775260261.84943
2006	-763281948.43081
2007	-435297831.55976
2008	-886053834.54901
2009	-719750181.34164
2010	-840271972.50505
2011	-578920738.11148
2012	-932893414.74958
2013	-383539344.45079
2014	-358651677.98044
2015	-420518780.0724
2016	-650545427.8047
2017	-441493072.0543