Year	US Dollars
1966	96750000
1967	105930000.30518
1968	122839996.33789
1969	122459999.08447
1970	131580001.83106
1971	123089996.33789
1972	147570007.32422
1973	221589996.33789
1974	160699996.94824
1975	238860000.61035
1976	260220001.2207
1977	263140014.64844
1978	240679992.67578
1979	326519989.01367
1980	321739990.23438
1981	341049987.79297
1982	434220001.2207
1983	471640014.64844
1984	488779998.7793
1985	476619995.11719
1986	502920013.42773
1987	506869995.11719
1988	548130004.88281
1989	494829986.57227
1990	370350006.10352
1991	448329986.57227
1992	432839996.33789
1993	464720001.2207
1994	498480010.98633
1995	543719970.70312
1996	492420013.42773
1997	506209991.45508
1998	511029998.7793
1999	504739990.23438