Year	current US$
1960	1264000000
1961	1024000000
1962	393000000
1963	683000000
1964	703000000
1965	671000000
1966	643000000
1967	639000000
1968	815000000
1969	1009000000
1970	1257000000
1971	1227000000
1972	1494000000
1973	2236000000
1974	4035000000
1975	5498000000
1976	5081000000
1977	7125000000
1978	8548000000
1979	8403000000
1980	10558000000
1981	11303000000
1982	10754000000
1983	10399000000
1984	10288000000
1985	9841000000
1986	9228000000
1987	7042000000
1988	7690000000
1989	9470000000
1990	9770000000
1991	7770000000
1992	8310000000
1993	8785000000
1994	9154000000
1995	10100000000
1996	9090000000
1997	8688000000
1998	9400000000
1999	9162000000
2000	9171000000
2001	9940000000
2002	11969000000
2003	12380000000
2004	18169000000
2005	20357000000
2006	21456000000
2007	27631000000
2008	39479000000
2009	39294000000
2010	40473000000
2011	47247000000
2012	50378000000
2013	55028000000
2014	58580000000
2015	51702000000
2016	47089000000
2017	46059000000
2018	46330000000
2019	44632000000
2020	35547000000
2021	37466000000
2022	38868000000
2023	41849000000