Year	current US$
1960	2000000
1961	2000000
1962	10000000
1963	35000000
1964	125000000
1965	190000000
1966	241000000
1967	262000000
1968	335000000
1969	407000000
1970	523000000
1971	871000000
1972	1157000000
1973	1807000000
1974	6414000000
1975	7262000000
1976	9535000000
1977	9636000000
1978	9126000000
1979	13652000000
1980	21970000000
1981	22380000000
1982	18780000000
1983	16900000000
1984	16500000000
1985	16780000000
1986	10640000000
1987	12380000000
1988	12040000000
1989	17596000000
1990	23544000000
1991	24436000000
1992	24756000000
1993	25620000000
1994	26403000000
1995	28364000000
1996	37334000000
1997	40423000000
1998	33837000000
1999	36474000000
2000	49835000000
2001	48414000000
2002	52163000000
2003	67135000000
2004	90997000000
2005	117287000000
2006	145587000000
2007	178630000000
2008	239213000000
2009	191802000000
2010	213539000000
2011	302037000000
2012	359728000000
2013	374214000000
2014	343036000000
2015	300477000000
2016	295031000000
2017	313603000000
2018	387964000000
2019	389428000000
2020	335297000000
2021	425160000000
2022	515621000000
2023	487778000000