Year	current US$
1960	43000000
1961	41000000
1962	59000000
1963	57000000
1964	65000000
1965	87000000
1966	103000000
1967	118000000
1968	147000000
1969	165000000
1970	190000000
1971	245000000
1972	377000000
1973	921000000
1974	1636000000
1975	1233000000
1976	546000000
1977	760000000
1978	830000000
1979	850000000
1980	955000000
1981	920000000
1982	800000000
1983	760000000
1984	378000000
1985	288000000
1986	550000000
1987	650000000
1988	780000000
1989	485000000
1990	494000000
1991	539000000
1992	560000000
1993	452000000
1994	470000000
1995	656000000
1996	736000000
1997	643000000
1998	662000000
1999	677000000
2000	715000000
2001	1093000000
2002	1238000000
2003	1813000000
2004	2199000000
2005	2337000000
2006	2814000000
2007	3574000000
2008	4454000000
2009	4187000000
2010	5021000000
2011	5664000000
2012	5615000000
2013	5170000000
2014	4548000000
2015	3982000000
2016	3930000000
2017	4026000000
2018	3830000000
2019	4829000000
2020	4085000000
2021	4590000000
2022	4370000000
2023	3083000000