Year	US Dollars adjusted for inflation)
1960	264000000
1961	82000000
1962	330000000
1963	98000000
1964	631000000
1965	488000000
1966	213000000
1967	376000000
1968	107000000
1969	305000000
1970	304000000
1971	581000000
1972	689000000
1973	246000000
1974	418000000
1975	912000000
1976	1288000000
1977	980000000
1978	1281000000
1979	739000000
1980	677000000
1981	971000000
1982	463000000
1983	403000000
1984	366000000
1985	189000000
1986	202000000
1987	36000000
1988	526000000
1989	1220000000
1990	907000000
1991	487000000
1992	2129000000
1993	894000000
1994	1212000000
1995	871000000
1996	380000000
1997	807000000
1998	1719000000
1999	842000000
2000	709000000
2001	787000000
2002	401000000
2003	2163000000
2004	1098000000
2005	407000000
2006	720000000
2007	1668000000
2008	482000000
2009	1220000000
2010	630000000
2011	70000000
2012	19000000
2013	28000000
2014	204000000
2015	728000000
2016	302000000
2017	51000000
2018	39000000
2019	93000000
2020	101000000
2021	246000000
2022	493000000