Year	US Dollars adjusted for inflation)
1960	441000000
1961	752000000
1962	995000000
1963	180000000
1964	552000000
1965	296000000
1966	16000000
1967	1000000
1968	0
1969	9000000
1970	27000000
1971	92000000
1972	5000000
1973	73000000
1974	73000000
1975	4000000
1976	156000000
1977	62000000
1978	124000000
1979	369000000
1980	898000000
1981	790000000
1982	357000000
1983	228000000
1984	100000000
1985	289000000
1986	432000000
1987	264000000
1988	289000000
1989	245000000
1990	202000000
1991	11000000
1992	51000000
1993	212000000
1994	471000000
1995	283000000
1996	379000000
1997	103000000
1998	87000000
1999	163000000
2000	146000000
2001	24000000
2002	63000000
2003	353000000
2004	75000000
2005	33000000
2006	62000000
2007	578000000
2008	246000000
2009	445000000
2010	229000000
2011	255000000
2012	216000000
2013	828000000
2014	1196000000
2015	436000000
2016	378000000
2017	1120000000
2018	325000000
2019	234000000
2020	276000000
2021	321000000
2022	68000000