Year	current US$
1960	235000000
1961	200000000
1962	86000000
1963	131000000
1964	87000000
1965	97000000
1966	104000000
1967	78000000
1968	103000000
1969	132000000
1970	179000000
1971	203000000
1972	208000000
1973	251000000
1974	349000000
1975	300000000
1976	224000000
1977	203000000
1978	196000000
1979	199000000
1980	1519000000
1981	1421000000
1982	1297000000
1983	1213000000
1984	1176000000
1985	1247000000
1986	1283000000
1987	1774000000
1988	1610000000
1989	1925000000
1990	1739000000
1991	1304000000
1992	935000000
1993	614000000
1994	667000000
1995	871000000
1996	1089000000
1997	770000000
1998	1102000000
1999	568000000
2000	683000000
2001	790000000
2002	1081000000
2003	1495000000
2004	2051000000
2005	2690000000
2006	2892000000
2007	3400000000
2008	4300000000
2009	3900000000
2010	4500000000
2011	5500000000
2012	6100000000
2013	6300000000
2014	7087000000
2015	8068000000
2016	5492000000
2017	5803000000
2018	7930000000
2019	8825000000
2020	6938000000
2021	7214000000
2022	11407000000
2023	11600000000