Year	US Dollars
1960	-85828368.83762
1961	-97378322.20622
1962	-54056319.93004
1963	-36814246.78138
1964	-33975283.72736
1965	-33869127.39411
1966	-46809154.93088
1967	-60162412.92769
1968	-67457195.71948
1969	-65779205.33788
1970	-63313319.04639
1971	-64643481.45046
1972	-96418040.5325
1973	-63708744.43293
1974	-36559241.19113
1975	-213706220.79718
1976	-197530413.75692
1977	-150603456.54572
1978	-152446251.40392
1979	-14573035.15469
1980	-1893226.24811
1981	-360282179.63424
1982	-286056638.38692
1983	129636323.70745
1984	351064560.88354
1985	16916595.91552
1986	-255843169.55214
1987	71538716.71453
1988	4364639.16136
1989	327264196.47261
1990	916179730.30643
1991	370161389.17552
1992	711115495.45547
1993	220615289.04849
1994	-277829402.38078
1995	23204862.52185
1996	216181959.07203
1997	358513980.68838
1998	71226191.69905
1999	310385381.43064
2000	1181205188.99295
2001	673628206.43118
2002	832817026.1706
2003	166506618.28633
2004	1380242400.87922
2005	1804965594.12787
2006	1433353513.0996
2007	2099206891.02604
2008	3338194076.75613
2009	1939099037.81622
2010	3653006297.48605
2011	4247955087.25886
2012	3206911053.30158
2013	1473447494.13003
2014	387627802.55453
2015	-2317453983.81434
2016	-1750822332.64228
2017	1827036361.44366