Year	US Dollars adjusted for inflation)
1960	21000000
1961	12000000
1962	20000000
1963	74000000
1964	50000000
1965	77000000
1966	508000000
1967	889000000
1968	805000000
1969	856000000
1970	859000000
1971	735000000
1972	1502000000
1973	3276000000
1974	3420000000
1975	1411000000
1976	527000000
1977	931000000
1978	871000000
1979	2045000000
1980	1859000000
1981	1338000000
1982	1973000000
1983	2233000000
1984	1809000000
1985	1575000000
1986	1262000000
1987	1409000000
1988	1312000000
1989	663000000
1990	739000000
1991	320000000
1992	240000000
1993	171000000
1994	19000000
1995	35000000
1996	35000000
1997	35000000
1998	55000000
1999	58000000
2000	64000000
2001	28000000
2002	45000000
2003	69000000
2004	25000000
2005	35000000
2006	100000000
2007	20000000
2008	294000000
2009	205000000
2010	413000000
2011	493000000
2012	516000000
2013	506000000
2014	21000000
2015	22000000
2016	8000000
2017	37000000
2018	199000000
2019	36000000
2020	84000000
2021	11000000