Year	current US$
1960	16000000
1961	19000000
1962	24000000
1963	18000000
1964	23000000
1965	26000000
1966	28000000
1967	32000000
1968	32000000
1969	33000000
1970	24000000
1971	28000000
1972	27000000
1973	27000000
1974	15000000
1975	20000000
1976	4000000
1977	10000000
1978	9000000
1979	19000000
1980	26000000
1981	27000000
1982	31000000
1983	19000000
1984	18000000
1985	20000000
1986	52000000
1987	58000000
1988	61000000
1989	51000000
1990	61000000
1991	67000000
1992	56000000
1993	59000000
1994	37000000
1995	121000000
1996	292000000
1997	358000000
1998	317000000
1999	425000000
2000	451000000
2001	813000000
2002	507000000
2003	908000000
2004	1092000000
2005	1310000000
2006	2020000000
2007	2767000000
2008	3787000000
2009	5597000000
2010	5485000000
2011	6972000000
2012	7505000000
2013	6104000000
2014	5946000000
2015	3525000000
2016	2323000000
2017	2842000000
2018	3087000000
2019	2100000000
2020	1546000000
2021	1746000000
2022	2988000000
2023	3100000000