Year	current US$
1960	14000000
1961	12000000
1962	11000000
1963	12000000
1964	12000000
1965	18000000
1966	21000000
1967	20000000
1968	22000000
1969	24000000
1970	29000000
1971	33000000
1972	35000000
1973	34000000
1974	58000000
1975	99000000
1976	106000000
1977	123000000
1978	188000000
1979	192000000
1980	243000000
1981	283000000
1982	286000000
1983	279000000
1984	278000000
1985	298000000
1986	349000000
1987	352000000
1988	370000000
1989	333000000
1990	288000000
1991	306000000
1992	288000000
1993	332000000
1994	236000000
1995	236000000
1996	258000000
1997	297000000
1998	285000000
1999	253000000
2000	211000000
2001	281000000
2002	248000000
2003	259000000
2004	284000000
2005	471000000
2006	591000000
2007	771000000
2008	1174000000
2009	1308000000
2010	1431000000
2011	2039000000
2012	2300000000
2013	2302000000
2014	2470000000
2015	2382000000
2016	2254000000
2017	2212000000
2018	2464000000
2019	2659000000
2020	2542000000
2021	2895000000
2022	3569000000
2023	3897000000