Year	US Dollars adjusted for inflation)
1960	474000000
1961	523000000
1962	494000000
1963	538000000
1964	326000000
1965	372000000
1966	218000000
1967	329000000
1968	250000000
1969	526000000
1970	764000000
1971	400000000
1972	471000000
1973	292000000
1974	302000000
1975	390000000
1976	368000000
1977	492000000
1978	876000000
1979	323000000
1980	580000000
1981	984000000
1982	610000000
1983	764000000
1984	943000000
1985	600000000
1986	920000000
1987	437000000
1988	246000000
1989	336000000
1990	759000000
1991	340000000
1992	42000000
1993	1000000
1994	1000000
1995	1000000
1996	122000000
1999	7000000
2003	2000000
2004	12000000
2005	132000000
2006	22000000
2007	48000000
2008	117000000
2009	119000000
2010	8000000
2011	29000000
2012	5000000
2015	5000000
2019	2000000
2020	44000000
2021	1000000
2022	4000000