Year	US Dollars adjusted for inflation)
1960	38000000
1961	45000000
1962	44000000
1963	13000000
1964	22000000
1965	32000000
1966	56000000
1967	55000000
1968	60000000
1969	36000000
1970	251000000
1971	530000000
1972	123000000
1973	15000000
1974	75000000
1975	123000000
1976	70000000
1977	54000000
1978	55000000
1979	261000000
1980	156000000
1981	128000000
1982	119000000
1983	117000000
1984	227000000
1985	214000000
1986	322000000
1987	233000000
1988	515000000
1989	403000000
1990	228000000
1991	156000000
1992	149000000
1993	103000000
1994	111000000
1995	226000000
1996	348000000
1997	104000000
1998	337000000
1999	387000000
2000	360000000
2001	896000000
2002	163000000
2003	515000000
2004	295000000
2005	531000000
2006	387000000
2007	331000000
2008	454000000
2009	409000000
2010	660000000
2011	698000000
2012	478000000
2013	387000000
2014	341000000
2015	181000000
2016	264000000
2017	81000000
2018	154000000
2019	215000000
2020	282000000
2021	332000000
2022	68000000