Year	current US$
1960	5000000
1961	6000000
1962	8000000
1963	17000000
1964	11000000
1965	18159999.8474121
1966	17959999.084472697
1967	20100000.3814697
1968	29909999.8474121
1969	46000000
1970	48000000
1971	53000000
1972	57000000
1973	63000000
1974	73000000
1975	79000000
1976	89000000
1977	91000000
1978	100000000
1979	111000000
1980	108000000
1981	133000000
1982	157000000
1983	130000000
1984	178000000
1985	154000000
1986	219000000
1987	173000000
1988	147000000
1989	156000000
1990	52000000
1991	5000000
1993	83000000