Year	US Dollars adjusted for inflation)
1960	22000000
1961	37000000
1962	93000000
1963	14000000
1964	16000000
1965	82000000
1966	159000000
1967	147000000
1968	87000000
1969	41000000
1970	80000000
1971	1000000
1973	21000000
1974	198000000
1975	207000000
1976	216000000
1977	408000000
1978	419000000
1979	725000000
1980	467000000
1981	798000000
1982	527000000
1983	394000000
1984	72000000
1985	50000000
1986	31000000
1987	32000000
1988	111000000
1989	126000000
1990	137000000
1991	62000000
1992	17000000
1993	98000000
1994	117000000
1995	28000000
1996	89000000
1997	220000000
1999	60000000
2000	125000000
2001	11000000
2002	155000000
2003	12000000
2004	14000000
2005	101000000
2006	47000000
2007	27000000
2008	46000000
2009	39000000
2010	309000000
2011	1406000000
2012	879000000
2013	62000000
2014	572000000
2015	47000000
2016	287000000
2017	605000000
2018	462000000
2019	48000000
2020	12000000
2021	235000000
2022	352000000