Year	US Dollars adjusted for inflation)
1968	2000000
1969	3000000
1970	6000000
1971	16000000
1975	38000000
1976	26000000
1977	55000000
1978	16000000
1979	14000000
1980	57000000
1981	48000000
1982	129000000
1983	468000000
1984	328000000
1985	2000000
1986	2000000
1987	57000000
1988	91000000
1989	10000000
1990	5000000
1991	17000000
1992	63000000
1993	10000000
1994	9000000
1995	10000000
1996	200000000
1997	244000000
1998	302000000
1999	61000000
2000	3000000
2007	27000000
2009	286000000
2010	30000000
2011	190000000
2012	335000000
2013	82000000
2014	55000000
2015	520000000
2016	885000000
2017	619000000
2018	581000000
2019	2048000000
2020	838000000
2021	2075000000
2022	3342000000