Year	current US$
1960	11000000
1961	15000000
1962	17000000
1963	18000000
1964	24000000
1965	28000000
1966	29000000
1967	32000000
1968	40000000
1969	41000000
1970	34000000
1971	32000000
1972	48000000
1973	73000000
1974	155000000
1975	153000000
1976	207000000
1977	249000000
1978	298000000
1979	403000000
1980	574000000
1981	733000000
1982	752000000
1983	580000000
1984	752000000
1985	789000000
1986	733000000
1987	930000000
1988	1019000000
1989	1107000000
1990	1064000000
1991	1130000000
1992	1215000000
1993	1246000000
1994	1424000000
1995	1769000000
1996	1816000000
1997	1836000000
1998	1802000000
1999	1832000000
2000	1899000000
2001	2293000000
2002	2770000000
2003	3082000000
2004	3883000000
2005	4302000000
2006	5204000000
2007	5725000000
2008	7938000000
2009	6375000000
2010	7028000000
2011	8006000000
2012	7887000000
2013	7920000000
2014	8385000000
2015	7833000000
2016	7549000000
2017	7511000000
2018	7750000000
2019	8317000000
2020	7943000000
2021	9358000000
2022	12780000000
2023	12763000000