Year	current US$
1960	40000000
1961	33000000
1962	37000000
1963	39000000
1964	41000000
1965	34000000
1966	38000000
1967	36000000
1968	38000000
1969	39000000
1970	55000000
1971	60000000
1972	69000000
1973	83000000
1974	125000000
1975	149000000
1976	207000000
1977	213000000
1978	233000000
1979	272000000
1980	375000000
1981	461000000
1982	387000000
1983	441000000
1984	450000000
1985	442000000
1986	360000000
1987	399000000
1988	344000000
1989	291000000
1990	332000000
1991	400000000
1992	278000000
1993	355000000
1994	251000000
1995	653000000
1996	665000000
1997	648000000
1998	797000000
1999	1025000000
2000	1036000000
2001	1013000000
2002	1130000000
2003	1188000000
2004	1306000000
2005	1454000000
2006	1619000000
2007	1682000000
2008	2315000000
2009	2124000000
2010	3146000000
2011	3020000000
2012	3170000000
2013	3580000000
2014	3734000000
2015	3683000000
2016	3423000000
2017	3890000000
2018	4822000000
2019	4182000000
2020	3549000000
2021	4304000000
2022	4622000000
2023	3996000000