Year	US Dollars adjusted for inflation)
1960	40000000
1961	56000000
1962	64000000
1963	40000000
1964	56000000
1965	91000000
1966	198000000
1967	230000000
1968	145000000
1969	92000000
1970	9000000
1971	149000000
1972	124000000
1975	90000000
1976	230000000
1977	75000000
1978	281000000
1979	360000000
1980	352000000
1981	382000000
1982	294000000
1983	236000000
1984	368000000
1985	153000000
1986	284000000
1987	561000000
1988	1047000000
1989	2151000000
1990	1865000000
1991	1411000000
2002	34000000
2005	33000000
2006	3000000
2007	39000000
2008	145000000
2009	324000000
2010	360000000
2011	628000000
2012	519000000
2013	255000000
2014	317000000
2015	139000000
2016	169000000
2017	236000000
2018	313000000
2019	383000000
2020	234000000
2021	65000000