Year	US Dollars adjusted for inflation)
1960	153000000
1961	523000000
1962	1320000000
1963	283000000
1964	247000000
1965	130000000
1966	232000000
1967	162000000
1968	155000000
1969	155000000
1970	155000000
1971	162000000
1972	452000000
1973	420000000
1974	408000000
1975	200000000
1976	316000000
1977	609000000
1978	503000000
1979	410000000
1980	349000000
1981	964000000
1982	964000000
1983	770000000
1984	426000000
1985	352000000
1986	281000000
1987	73000000
1988	167000000
1989	94000000
1990	169000000
1991	159000000
2004	8000000