Year	current US$
1960	97000000
1961	98000000
1962	103000000
1963	135000000
1964	125000000
1965	144000000
1966	131000000
1967	121000000
1968	189000000
1969	225000000
1970	226000000
1971	207000000
1972	221000000
1973	353000000
1974	478000000
1975	447000000
1976	511000000
1977	704000000
1978	802000000
1979	1132000000
1980	1384000000
1981	1105000000
1982	1064000000
1983	976000000
1984	886000000
1985	722000000
1986	782000000
1987	806000000
1988	927000000
1989	1682000000
1990	2002000000
1991	1834000000
1992	1840000000
1993	1883000000
1994	1486000000
1995	1651000000
1996	1768000000
1997	1860000000
1998	1671000000
1999	1601000000
2000	1833000000
2001	1749000000
2002	1802000000
2003	2283000000
2004	2477000000
2005	2861000000
2006	3576000000
2007	4230000000
2008	5241000000
2009	3552000000
2010	3878000000
2011	4517000000
2012	4274000000
2013	4515000000
2014	5145000000
2015	4058000000
2016	3305000000
2017	3233000000
2018	3803000000
2019	4084000000
2020	3132000000
2021	4317000000
2022	5584000000
2023	4400000000