Year	US Dollars adjusted for inflation)
1960	143000000
1961	544000000
1962	686000000
1963	737000000
1964	843000000
1965	950000000
1966	1533000000
1967	2238000000
1968	1269000000
1969	1235000000
1970	1674000000
1971	1984000000
1972	3256000000
1973	2556000000
1974	1077000000
1975	565000000
1976	159000000
1977	410000000
1978	135000000
1979	630000000
1980	1001000000
1981	1176000000
1982	2493000000
1983	1692000000
1984	1511000000
1985	974000000
1986	1486000000
1987	1648000000
1988	427000000
1989	297000000
1990	563000000
1991	887000000
1992	973000000
1993	1257000000
1994	2020000000
1995	1703000000
1996	969000000
1997	1040000000
1998	482000000
1999	517000000
2000	834000000
2001	829000000
2002	718000000
2003	632000000
2004	653000000
2005	799000000
2006	724000000
2007	692000000
2008	335000000
2009	161000000
2010	688000000
2011	632000000
2012	283000000
2013	678000000
2014	430000000
2015	1444000000
2016	1643000000
2017	2340000000
2018	1638000000
2019	1157000000
2020	1403000000
2021	1287000000
2022	701000000