Year	US Dollars
1960	-125688526.9287
1961	-162624721.09823
1962	-303570494.78689
1963	-32295301.26309
1964	-263891334.84445
1965	-239529908.63826
1966	-261531453.25472
1967	-340925099.11563
1968	-268361181.86667
1969	-426694519.46667
1970	-483733333.33333
1971	-386598979.30329
1972	-94829695.0772
1973	-582031572.85726
1974	-1143907201.10256
1975	-388430615.01514
1976	-2020016542.59719
1977	-1776052771.85501
1978	-1337903021.07134
1979	-1675917126.02167
1980	-320268280.13272
1981	870511272.70685
1982	548941481.44592
1983	1339967195.18863
1984	991058841.70481
1985	485542259.63535
1986	-175380051.90953
1987	2248147011.096
1988	4016786748.86727
1989	4265957155.75497
1990	7681220308.30883
1991	8657703431.56414
1992	10561620914.1664
1993	10779006462.1601
1994	9249913530.17011
1995	8712694559.47451
1996	10626519737.1825
1997	7561511090.92286
1998	5440693648.51958
1999	10677302829.6207
2000	11016070566.9854
2001	11766833277.2625
2002	12240110453.8488
2003	14819891616.1938
2004	14200397255.9296
2005	14557521386.0495
2006	11579504943.8353
2007	9254551132.50179
2008	12450324630.7448
2009	14446454886.3064
2010	22365455652.7073
2011	21997270523.5075
2012	19694342992.1349
2013	22702265672.6533
2014	24576537945.2885
2015	21971320903.6099
2016	19009559685.9315
2017	22930098870.8168