Year	current US$
1960	17000000
1961	5000000
1962	6000000
1963	38000000
1964	43000000
1965	57000000
1966	51000000
1967	50000000
1968	49000000
1969	54000000
1970	42000000
1971	48000000
1972	58000000
1973	63000000
1974	66000000
1975	100000000
1976	98000000
1977	81000000
1978	91000000
1979	109000000
1980	80000000
1981	141000000
1982	88000000
1983	93000000
1984	127000000
1985	160000000
1986	142000000
1987	151000000
1988	191000000
1989	159000000
1990	204000000
1991	257000000
1992	369000000
1993	384000000
1994	362000000
1995	345000000
1996	385000000
1997	406000000
1998	474000000
1999	602000000
2000	804000000
2001	737000000
2002	568000000
2003	662000000
2004	772000000
2005	863000000
2006	838000000
2007	868000000
2008	939000000
2009	823000000
2010	856000000
2011	919000000
2012	911000000
2013	879000000
2014	889000000
2015	721000000
2016	696000000
2017	742000000
2018	786000000
2019	968000000
2020	856000000
2021	1684000000
2022	1296000000
2023	1015000000