Year	US Dollars adjusted for inflation)
1960	51000000
1961	45000000
1962	11000000
1963	4000000
1964	2000000
1965	102000000
1966	86000000
1967	43000000
1968	16000000
1969	26000000
1970	9000000
1971	90000000
1972	52000000
1973	114000000
1974	53000000
1975	132000000
1976	256000000
1977	198000000
1978	143000000
1979	92000000
1980	75000000
1981	39000000
1982	17000000
1983	117000000
1984	39000000
1985	23000000
1987	26000000
1988	12000000
1989	19000000
1990	33000000
1991	34000000
1992	43000000
1993	62000000
1994	72000000
1995	28000000
1996	41000000
1997	70000000
1998	64000000
2001	10000000
2002	5000000
2003	10000000
2004	34000000
2005	12000000
2006	23000000
2007	16000000
2008	10000000
2009	1000000
2010	3000000
2011	63000000
2012	16000000
2013	78000000
2014	12000000
2015	153000000
2016	228000000
2017	278000000
2018	17000000
2019	185000000
2020	348000000
2021	337000000
2022	338000000