Year	current US$
1960	362000000
1961	335000000
1962	335000000
1963	361000000
1964	470000000
1965	527000000
1966	691000000
1967	654000000
1968	759000000
1969	1073000000
1970	1001000000
1971	1226000000
1972	758000000
1973	1144000000
1974	1407000000
1975	810000000
1976	1070000000
1977	896000000
1978	856000000
1979	1373000000
1980	1298000000
1981	1079000000
1982	1024000000
1983	836000000
1984	652000000
1985	784000000
1986	517000000
1987	873000000
1988	1179000000
1989	1347000000
1990	1309000000
1991	1083000000
1992	756000000
1993	826000000
1994	927000000
1995	1040000000
1996	1037000000
1997	915000000
1998	1032000000
1999	1063000000
2000	892000000
2001	987000000
2002	956000000
2003	980000000
2004	1576000000
2005	1810000000
2006	3770000000
2007	4617000000
2008	5099000000
2009	4312000000
2010	7200000000
2011	9001000000
2012	9365000000
2013	10607000000
2014	9694000000
2015	6607000000
2016	6372000000
2017	8000000000
2018	9034000000
2019	7039000000
2020	7924000000
2021	10101000000
2022	11664000000
2023	9652000000