Year	US Dollars
1960	-46149900
1961	-38827200
1962	-26011300
1963	-53715700
1964	-34693800
1965	-32354100
1966	-42123000
1967	-20891000
1968	6750700
1969	-30186100
1970	-78331400
1971	-97532200
1972	-135926500
1973	-126799800
1974	-327422300
1975	-288392900
1976	-294310400
1977	-175326500
1978	-252021800
1979	-517317900
1980	-343256800
1981	-477566100
1982	-182648100
1983	67528200
1984	-177016300
1985	-207703800
1986	-211369700
1987	-263778300
1988	115280000
1989	-300677400
1990	-437957800
1991	-816562300
1992	-978414600
1993	-1015434100
1994	-1079342300
1995	-1264813600
1996	-1325880600
1997	-1213705500
1998	-1847765700
1999	-1574358700
2000	-1226447600
2001	-728553600
2002	-854017500
2003	-823460300
2004	-1218675000
2005	-1095894100
2006	-1006643100
2007	-1416900300
2008	-2646352400
2009	175570100
2010	-2411095800
2011	-2090467100
2012	-3103448200
2013	-3333655400
2014	-4181248700
2015	-2515979900
2016	-2615578300