Year	current US$
1960	120000000
1961	136000000
1962	160000000
1963	181000000
1964	181000000
1965	208000000
1966	235000000
1967	251000000
1968	266000000
1969	294000000
1970	357000000
1971	396000000
1972	440000000
1973	502000000
1974	822000000
1975	892000000
1976	848000000
1977	861000000
1978	942000000
1979	1184000000
1980	1449000000
1981	1540000000
1982	1570000000
1983	1412000000
1984	1423000000
1985	1392000000
1986	1229000000
1987	1306000000
1988	751000000
1989	986000000
1990	1539000000
1991	1695000000
1992	2024000000
1993	2188000000
1994	2404000000
1995	2511000000
1996	2780000000
1997	3002000000
1998	3398000000
1999	3516000000
2000	3379000000
2001	2964000000
2002	2982000000
2003	3086000000
2004	3594000000
2005	9600000000
2006	10775000000
2007	13269000000
2008	15737000000
2009	13877000000
2010	16737000000
2011	21802000000
2012	26524000000
2013	22988000000
2014	24401000000
2015	22504000000
2016	20935000000
2017	21934000000
2018	23006000000
2019	21492000000
2020	14740000000
2021	20596000000
2022	29249000000
2023	35095000000