Year	US Dollars adjusted for inflation)
1960	853000000
1961	849000000
1962	688000000
1963	1001000000
1964	1564000000
1965	1154000000
1966	980000000
1967	745000000
1968	860000000
1969	932000000
1970	796000000
1971	922000000
1972	848000000
1973	1044000000
1974	1064000000
1975	963000000
1976	785000000
1977	924000000
1978	1112000000
1979	1127000000
1980	1090000000
1981	807000000
1982	725000000
1983	529000000
1984	462000000
1985	922000000
1986	1382000000
1987	1029000000
1988	899000000
1989	499000000
1990	227000000
1991	76000000
1992	100000000
1993	4000000
1994	74000000
1995	250000000
1996	102000000
1997	1000000
1998	3000000
1999	25000000
2000	148000000
2001	33000000
2002	256000000
2003	347000000
2004	223000000
2005	103000000
2006	439000000
2007	966000000
2008	633000000
2009	191000000
2010	169000000
2011	137000000
2012	223000000
2013	142000000
2014	258000000
2015	140000000
2016	47000000
2017	128000000
2018	57000000
2019	264000000
2020	143000000
2021	74000000
2022	639000000