Year	US Dollars
1960	34180000.30518
1961	40659999.84741
1962	53610000.61035
1963	112379997.25342
1964	72150001.52588
1965	116389999.38965
1966	112459999.08447
1967	122230003.35693
1968	173289993.28613
1969	254750000
1970	253000000
1971	266160003.66211
1972	273920013.42773
1973	298010009.76562
1974	313339996.33789
1975	310070007.32422
1976	323440002.44141
1977	311390014.64844
1978	320839996.33789
1979	327290008.54492
1980	293200012.20703
1981	334070007.32422
1982	375089996.33789
1983	298619995.11719
1984	399269989.01367
1985	332570007.32422
1986	468660003.66211
1987	363040008.54492
1988	290609985.35156
1989	294119995.11719
1990	107569999.69482
1991	36889999.38965
1992	9439999.58038
1993	143380004.88281
1994	3720000.02861
1995	-759999.99046
1996	-1419999.95708
1997	939999.99762
1998	280000.00119
1999	159999.99642