Year	US Dollars
1960	29472269.66242
1961	-44208310.74364
1962	-3117229.04282
1963	-88983517.29809
1964	-220475074.57404
1965	-218774782.97493
1966	-152462264.77614
1967	-238611865.52015
1968	-245129802.7612
1969	-298123196.48915
1970	-377188130.84796
1971	-388240255.40887
1972	-506696083.33333
1973	-429877226.57756
1974	-831762076.32438
1975	-1012377602.52366
1976	-1304107178.45118
1977	-515438377.50485
1978	-1317974808.20106
1979	-1508080952.69382
1980	-2247061873.38501
1981	-1819522643.81885
1982	-1937075848.30339
1983	-1604040404.0404
1984	-1895720000
1985	-1660461538.46154
1986	-1448600000
1987	-1629838709.67742
1988	-1813076878.74371
1989	-2085202591.33366
1990	-2259240016.79713
1991	-1722661064.42577
1992	-1509549071.61804
1993	-1687195767.19577
1994	-1642094763.09227
1995	-2458582089.55224
1996	-3094229828.85086
1997	-2549601873.5363
1998	-2182026431.71806
1999	-2497212978.36938
2000	-2472788709.99801
2001	-2874981467.75389
2002	-2269650008.70625
2003	-2884974093.26425
2004	-2972345846.78104
2005	-3896617886.17886
2006	-3881819535.43776
2007	-4738271068.63597
2008	-6692012826.11864
2009	-6366463960.55952
2010	-6633869734.45903
2011	-9746510605.48387
2012	-10385405740.1393
2013	-10830292256.1686
2014	-11297649912.1853
2015	-14460497206.6392
2016	-10306581262.434
2017	-13065015166.8352