Year	current US$
1960	9300000
1961	16500000
1962	17900000
1963	18770000
1964	10200000
1965	8600000
1966	12300000
1967	10000000
1968	6750000
1969	13420000
1970	21140000
1971	26059448.463123
1972	31330883.2410085
1973	34997110.8150034
1974	42323321.4288449
1975	68367664.0795903
1976	84875567.8566248
1977	119977498.669984
1978	126341462.786083
1979	43791405.7361798
1980	14563752.7829041
1981	30711888.6385361
1982	6505268.44208715
1983	9166434.59180907
1984	1049010.47848833
1985	2500000
1986	12800000
1987	7300000
1988	15300000
1989	15400000