Year	US Dollars
1960	791750000
1961	770590026.85547
1962	730429992.67578
1963	760669982.91016
1964	631270019.53125
1965	786130004.88281
1966	691989990.23438
1967	433570007.32422
1968	364529998.7793
1969	308359985.35156
1970	398809997.55859
1971	423820007.32422
1972	443820007.32422
1973	839559997.55859
1974	483660003.66211
1975	1770329956.05469
1976	2321840087.89063
1977	2704560058.59375
1978	2827110107.42188
1979	3456120117.1875
1980	2344000000
1981	1898189941.40625
1982	2013670043.94531
1983	3023129882.8125
1984	2748949951.17188
1985	4151439941.40625
1986	3962909912.10938
1987	2483620117.1875
1988	2379739990.23438
1989	2207100097.65625
1990	2426139892.57813
1991	2899639892.57813
1992	3431250000
1993	2084560058.59375
1994	2008729980.46875
1995	530669982.91016
1996	3460280029.29688