Year	US Dollars adjusted for inflation)
1960	163000000
1961	87000000
1962	271000000
1963	407000000
1964	417000000
1965	437000000
1966	319000000
1967	283000000
1968	978000000
1969	1381000000
1970	1122000000
1971	1341000000
1972	891000000
1973	1959000000
1974	1174000000
1975	1624000000
1976	1939000000
1977	1261000000
1978	1326000000
1979	698000000
1980	1260000000
1981	1654000000
1982	866000000
1983	487000000
1984	286000000
1985	309000000
1986	1185000000
1987	1080000000
1988	582000000
1989	24000000
1990	81000000
1991	1210000000
1992	1335000000
1993	716000000
1994	761000000
1995	366000000
1996	108000000
1997	59000000
1998	1289000000
1999	1191000000
2000	354000000
2001	116000000
2002	337000000
2003	179000000
2004	846000000
2005	1135000000
2006	1125000000
2007	835000000
2008	679000000
2009	156000000
2010	71000000
2011	86000000
2012	127000000
2013	216000000
2014	549000000
2015	688000000
2016	622000000
2017	535000000
2018	494000000
2019	519000000
2020	367000000
2021	476000000
2022	829000000