Year	US Dollars adjusted for inflation)
1960	593000000
1961	312000000
1962	266000000
1963	582000000
1964	835000000
1965	412000000
1966	335000000
1967	593000000
1968	426000000
1969	644000000
1970	396000000
1971	941000000
1972	1095000000
1973	789000000
1974	1279000000
1975	641000000
1976	360000000
1977	295000000
1978	984000000
1979	917000000
1980	487000000
1981	731000000
1982	483000000
1983	477000000
1984	549000000
1985	678000000
1986	472000000
1987	1429000000
1988	1628000000
1989	1017000000
1990	1241000000
1991	1279000000
1992	1879000000
1993	2329000000
1994	1891000000
1995	1564000000
1996	1484000000
1997	1512000000
1998	2626000000
1999	1733000000
2000	1180000000
2001	508000000
2002	872000000
2003	331000000
2004	257000000
2005	1094000000
2006	529000000
2007	690000000
2008	638000000
2009	731000000
2010	467000000
2011	760000000
2012	1481000000
2013	769000000
2014	1527000000
2015	445000000
2016	328000000
2017	429000000
2018	488000000
2019	756000000
2020	96000000
2021	272000000
2022	184000000