Year	US Dollars adjusted for inflation)
1960	214000000
1961	103000000
1962	55000000
1963	14000000
1964	51000000
1965	382000000
1966	302000000
1967	303000000
1968	133000000
1969	183000000
1970	233000000
1971	617000000
1972	767000000
1973	906000000
1974	583000000
1975	1185000000
1976	831000000
1977	321000000
1978	446000000
1979	656000000
1980	688000000
1981	630000000
1982	507000000
1983	604000000
1984	81000000
1985	327000000
1986	1089000000
1987	1091000000
1988	1942000000
1989	840000000
1990	699000000
1991	109000000
1992	207000000
1993	299000000
1994	853000000
1995	355000000
1996	424000000
1997	211000000
1998	86000000
1999	361000000
2000	320000000
2001	144000000
2002	271000000
2003	249000000
2004	305000000
2005	358000000
2006	312000000
2007	343000000
2008	347000000
2009	228000000
2010	272000000
2011	166000000
2012	219000000
2013	155000000
2014	108000000
2015	152000000
2016	104000000
2017	82000000
2018	149000000
2019	35000000
2020	71000000
2021	135000000
2022	173000000