Year	US Dollars
1960	1144711468.40703
1961	1080135447.35519
1962	546483965.78278
1963	110084946.05128
1964	-391581242.10046
1965	669241534.20233
1966	43879694.7363
1967	48844255.26256
1968	-372977405.25859
1969	-1112271526.6565
1970	806661155.07263
1971	1583994317.50917
1972	1578673602.08062
1973	1701532115.49794
1974	-3127386797.59956
1975	3516903778.49166
1976	-3460803059.27342
1977	-692698582.50869
1978	5305232558.13954
1979	2445266728.33796
1980	-10782365724.9301
1981	-9056125528.06276
1982	-14358718434.9736
1983	-1495825802.56476
1984	685281092.84696
1985	-2035333625.34677
1986	-933800549.29444
1987	-10257557568.4819
1988	-6711815879.30845
1989	-7027555007.1972
1990	-9957836405.25238
1991	-3984420416.23067
1992	9382899628.25279
1993	22223766504.517
1994	20831758034.0265
1995	25613089762.1238
1996	28611360430.82449
1997	43773881771.18449
1998	41278630197.90971
1999	35706371191.1357
2000	18100239543.0256
2001	21643847874.7204
2002	29737436476.5669
2003	26247178329.5711
2004	21425378693.8167
2005	1875388633.25457
2006	-5409609835.65425
2007	-18978921434.4374
2008	-33804013475.9045
2009	-21289247013.0592
2010	-34121147266.9336
2011	-55737411798.7394
2012	-34782503608.99469
2013	-29082829404.37129
2014	-32669491637.3463
2015	-13811208594.1363
2016	-20164039467.5028
2017	-28467515680.64