Year	US Dollars
1960	-63134666.2727
1961	105239091.55932
1962	89724330.36349
1963	80328378.78855
1964	90929406.48189
1965	-159868549.11726
1966	-131265806.16247
1967	31259927.87816
1968	-5639787.90497
1969	-62301326.84129
1970	33330298.4613
1971	681848163.24938
1972	961820300.68873
1973	1884185721.15495
1974	78211898.00423
1975	435486946.67887
1976	-735676966.87252
1977	-769358354.15923
1978	1703212504.14961
1979	-181625317.81391
1980	-1369918668.432
1981	681820219.61528
1982	250004854.678
1983	2647029085.31257
1984	4262391764.79122
1985	2308936679.87773
1986	5049542029.31102
1987	3909761040.31291
1988	3952640733.12443
1989	1671584203.26048
1990	1639752568.08813
1991	4546884365.44026
1992	4828079295.30547
1993	7084436107.61364
1994	9165759460.86055
1995	16842975901.7566
1996	17798985982.7021
1997	18379022646.0072
1998	16837067132.9199
1999	16430456041.828
2000	15246447359.8044
2001	14950963781.9365
2002	16670980065.9334
2003	20993903268.4912
2004	29009647702.3772
2005	27904216456.3568
2006	31882572985.281
2007	34031780789.4893
2008	32210556659.7381
2009	24753847761.896
2010	26702234435.7962
2011	26490159712.4939
2012	26820158722.8763
2013	26087924341.0894
2014	24763930075.057
2015	24207095786.929
2016	24893857445.55149
2017	22635998383.0204