Year	current US$
1960	18000000
1961	20000000
1962	35000000
1963	42000000
1964	47000000
1965	47000000
1966	43000000
1967	48000000
1968	49000000
1969	44000000
1970	31000000
1971	40000000
1972	60000000
1973	89000000
1974	229000000
1975	178000000
1976	221000000
1977	267000000
1978	308000000
1979	496000000
1980	911000000
1981	811000000
1982	993000000
1983	640000000
1984	1183000000
1985	1087000000
1986	777000000
1987	973000000
1988	937000000
1989	1247000000
1990	981000000
1991	1029000000
1992	1183000000
1993	1068000000
1994	959000000
1995	1172000000
1996	1345000000
1997	1668000000
1998	1365000000
1999	1560000000
2000	2489000000
2001	2055000000
2002	2280000000
2003	2677000000
2004	3433000000
2005	4745000000
2006	6078000000
2007	6293000000
2008	9170000000
2009	8202000000
2010	6918000000
2011	13824000000
2012	7438000000
2013	10453000000
2014	8673000000
2015	8623000000
2016	7901000000
2017	8252000000
2018	11155000000
2019	5576000000
2020	4893000000
2021	7390000000
2022	7160000000
2023	5970000000