Year	US Dollars adjusted for inflation)
1960	17000000
1961	12000000
1962	22000000
1964	5000000
1965	48000000
1966	227000000
1967	221000000
1968	456000000
1969	424000000
1970	95000000
1971	10000000
1972	104000000
1973	185000000
1974	378000000
1975	479000000
1976	612000000
1977	951000000
1978	1020000000
1979	765000000
1980	1090000000
1981	1810000000
1982	2214000000
1983	1818000000
1984	834000000
1985	1319000000
1986	2838000000
1987	2001000000
1988	775000000
1989	1382000000
1990	2043000000
1991	1033000000
1992	1118000000
1993	2358000000
1994	981000000
1995	983000000
1996	1724000000
1997	2790000000
1998	2886000000
1999	1580000000
2000	84000000
2001	60000000
2002	560000000
2003	160000000
2004	1163000000
2005	166000000
2006	205000000
2007	227000000
2008	387000000
2009	825000000
2010	1093000000
2011	1172000000
2012	930000000
2013	1526000000
2014	2743000000
2015	3389000000
2016	2947000000
2017	3920000000
2018	3276000000
2019	3484000000
2020	2491000000
2021	1739000000
2022	2272000000