Year	US Dollars
1960	955666666.66667
1961	1209969696.9697
1962	1411060606.06061
1963	1644333333.33333
1964	986909090.90909
1965	838644444.44444
1966	924688888.88889
1967	903177777.77778
1968	580600000
1969	473111111.11111
1970	516111111.11111
1971	813750000
1972	461863636.36364
1973	1620302325.58139
1974	6368744186.04651
1975	2160418604.65116
1976	270069767.44186
1977	-2880558139.53488
1978	-5176000000
1979	720139534.88372
1980	4658418604.65116
1981	3713232558.13954
1982	-2002883720.93023
1983	6526279069.76744
1984	4505700000
1985	3506506666.66667
1986	-251246913.58024
1987	-877193103.44828
1988	-3892310344.82759
1989	5490553314.12104
1990	9060385927.50533
1991	2652845070.42253
1992	-1493833333.33333
1993	-129529735.68282
1994	4841352861.95287
1995	3963416289.59276
1996	10367160076.6834
1997	6243387228.81703
1998	-1605986121.25639
1999	3677256067.36008
2000	13624892647.0588
2001	4092695868.45378
2002	11417950727.8835
2003	14324022551.707
2004	19149969333.2628
2005	27923335247.3921
2006	26368750349.3247
2007	13964625523.987
2008	31008694395.2252
2009	-7841993378.71863
2010	42952020030.16121
2011	32432802555.1955
2012	7391085491.80518
2013	-17614610714.6397
2014	-70922056745.4886