Year	current US$
1960	25000000
1961	25000000
1962	29000000
1963	29000000
1964	35000000
1965	31000000
1966	32000000
1967	59000000
1968	54000000
1969	54000000
1970	62000000
1971	62000000
1972	62000000
1973	82000000
1974	87000000
1975	133000000
1976	116000000
1977	189000000
1978	217000000
1979	85000000
1980	74000000
1981	108000000
1982	109000000
1983	157000000
1984	181000000
1985	166000000
1986	212000000
1987	226000000
1988	228000000
1989	240000000
1990	285000000
1991	249000000
1992	243000000
1993	200000000
1994	177000000
1995	365000000
1996	332000000
1997	334000000
1998	356000000
1999	316000000
2000	317000000
2001	679000000
2002	1646000000
2003	790000000
2004	953000000
2005	950000000
2006	1350000000
2007	1800000000
2008	2000000000
2009	2000000000
2010	2400000000
2011	3300000000
2012	2800000000
2013	3000000000
2014	4400000000
2015	3700000000
2016	2465000000
2017	1851000000
2018	1971000000
2019	1924000000
2020	1586000000
2021	1638000000
2022	2084000000
2023	2200000000