Year	current US$
1960	32000000
1961	36000000
1962	41000000
1963	48000000
1964	56000000
1965	62000000
1966	66000000
1967	67000000
1968	65000000
1969	77000000
1970	80000000
1971	92000000
1972	139000000
1973	190000000
1974	332000000
1975	469000000
1976	503000000
1977	716000000
1978	617000000
1979	532000000
1980	674000000
1981	841000000
1982	867000000
1983	685000000
1984	724000000
1985	855000000
1986	866000000
1987	732000000
1988	791000000
1989	767000000
1990	918000000
1991	834000000
1992	700000000
1993	845000000
1994	756000000
1995	882000000
1996	957000000
1997	1104000000
1998	1103000000
1999	841000000
2000	950000000
2001	1002000000
2002	1135000000
2003	1206000000
2004	1347000000
2005	1471000000
2006	1725000000
2007	2157000000
2008	2563000000
2009	2501000000
2010	2983000000
2011	3665000000
2012	5541000000
2013	6537000000
2014	9564000000
2015	6121000000
2016	6172000000
2017	3845000000
2018	3493000000
2019	3874000000
2020	3484000000
2021	3646000000
2022	5132000000
2023	6100000000