Year	US Dollars adjusted for inflation)
1960	219000000
1961	37000000
1962	4000000
1963	52000000
1964	263000000
1965	228000000
1966	373000000
1967	177000000
1968	199000000
1969	166000000
1970	141000000
1971	147000000
1972	185000000
1973	115000000
1974	63000000
1975	136000000
1976	142000000
1977	4000000
1978	217000000
1979	226000000
1980	272000000
1981	289000000
1982	175000000
1983	442000000
1984	404000000
1985	341000000
1986	108000000
1987	151000000
1988	179000000
1989	318000000
1990	438000000
1991	474000000
1992	386000000
1993	102000000
1994	118000000
1995	93000000
1996	187000000
1997	379000000
1998	435000000
1999	506000000
2000	22000000
2001	67000000
2002	62000000
2003	117000000
2004	203000000
2005	168000000
2006	83000000
2007	108000000
2008	17000000
2009	39000000
2010	48000000
2011	32000000
2012	10000000
2013	6000000
2014	5000000
2015	12000000
2016	73000000
2017	34000000
2018	10000000
2019	10000000
2020	10000000
2021	10000000