Year	US Dollars adjusted for inflation)
1960	2054000000
1961	2039000000
1962	2478000000
1963	3297000000
1964	3723000000
1965	3323000000
1966	3211000000
1967	1351000000
1968	1218000000
1969	1243000000
1970	1407000000
1971	2404000000
1972	853000000
1973	1742000000
1974	2132000000
1975	1835000000
1976	1387000000
1977	1042000000
1978	691000000
1979	65000000
1980	150000000
1981	261000000
1982	453000000
1983	434000000
1984	412000000
1985	130000000
1986	310000000
1987	320000000
1988	429000000
1989	707000000
1990	716000000
1991	694000000
1992	685000000
1993	535000000
1994	423000000
1995	228000000
1996	246000000
1997	60000000
1998	543000000
1999	129000000
2000	113000000
2001	133000000
2002	71000000
2003	63000000
2004	237000000
2005	199000000
2006	406000000
2007	71000000
2008	278000000
2009	331000000
2010	282000000
2011	84000000
2012	131000000
2013	113000000
2014	95000000
2015	96000000
2016	55000000
2017	43000000
2018	14000000
2019	38000000
2020	53000000
2021	192000000
2022	182000000