Year	US Dollars
1960	23320754.71698
1961	12249475.89099
1962	11942348.00839
1963	22764150.9434
1964	40066037.73585
1965	10784313.72549
1966	2240896.35854
1967	8823529.41176
1968	13725490.19608
1969	13865546.21849
1970	40756302.52101
1971	-58683473.38936
1972	38935574.22969
1973	57843137.2549
1974	-6847360.91298
1975	-53444444.44444
1976	43600000
1977	39764705.88235
1978	-126086956.52174
1979	40000000
1980	-82000000
1981	-80000000
1982	-199000000
1983	-111666666.66667
1984	-59033912.18167
1985	-44692957.41372
1986	-95262663.30084
1987	-614173466.45633
1988	-664216666.66667
1989	-534973285.23772
1990	-522041886.74971
1991	-480765181.58069
1992	-443762246.7479
1993	-454558162.5465
1994	-413340605.14429
1995	-520277752.84552
1996	-692906552.18785
1997	-466409534.97977
1998	-708909866.24219
1999	-691128206.65299
2000	-708892333.08777
2001	-718020536.67424
2002	-855807413.53535
2003	-875242031.19589
2004	-799302705.54999
2005	-958610966.97651
2006	-1300736280.3771
2007	-1638297639.30412
2008	-1096117922.88025
2009	-2218203349.00463
2010	-2312611016.86925
2011	-3006488530.14352
2012	-2982910866.05355
2013	-2533870887.80965
2014	-2722641992.47672
2015	-2920530793.26043
2016	-2421999275.08752
2017	-1914481130.79052