Year	US Dollars adjusted for inflation)
1960	168000000
1961	118000000
1962	278000000
1963	201000000
1964	321000000
1965	248000000
1966	341000000
1967	359000000
1968	380000000
1969	405000000
1970	180000000
1971	187000000
1972	627000000
1973	1846000000
1974	1425000000
1975	1125000000
1976	1136000000
1977	1059000000
1978	1782000000
1979	1359000000
1980	2242000000
1981	2573000000
1982	3261000000
1983	3369000000
1984	4535000000
1985	3965000000
1986	3381000000
1987	3464000000
1988	1897000000
1989	1490000000
1990	818000000
2004	74000000
2005	196000000
2006	303000000
2007	297000000
2008	375000000
2009	388000000
2010	439000000
2011	585000000
2012	500000000
2013	375000000
2014	660000000
2015	1471000000
2016	1787000000
2017	943000000
2018	452000000
2019	145000000
2020	4000000
2021	0
2022	55000000