Year	US Dollars
1960	-73117231.29417
1961	190917215.0459
1962	540255097.89585
1963	580875781.94817
1964	540255097.89585
1965	316841335.60809
1966	199041351.85636
1967	219351693.88252
1968	272158583.15054
1969	511820619.05922
1970	28434478.83662
1971	653993013.24234
1972	841833325.90976
1973	668543279.38072
1974	-683255149.90822
1975	-236584578.98699
1976	283300710.82724
1977	371407040.58564
1978	-804878048.78049
1979	-1356521739.13044
1980	-1150000000
1981	-3968253.96825
1982	4812000000
1983	2571000000
1984	54000000
1985	-12501000000
1986	-7390000000.00014
1987	291000000
1988	-4061000000.00001
1989	-4928000000
1990	10668000000
1991	11601000000
1992	4998000000
1993	-11792000000
1994	7357000000
1995	11958000000
1996	17550000000
1997	42823219999.99999
1998	43836689480.00031
1999	30640955366.5801
2000	28785851578.52
2001	28086220298.1298
2002	37382671264.0208
2003	35821129066.29099
2004	51174382539.9598
2005	124626797517.20001
2006	208918924500.59003
2007	308036028783.35999
2008	348832533153.922
2009	220130401366.78
2010	222399875337.87299
2011	180894229915.65402
2012	231865233940.08493
2013	234870526033.76495
2014	221550832014.84497
2015	358835723372.14008
2016	255483473384.00198
2017	209431185299.16498