Year	current US$
1960	69000000
1961	91000000
1962	132000000
1963	108000000
1964	111000000
1965	105000000
1966	114000000
1967	125000000
1968	108000000
1969	115000000
1970	150000000
1971	157000000
1972	179000000
1973	193000000
1974	288000000
1975	331000000
1976	399000000
1977	464000000
1978	481000000
1979	507000000
1980	535000000
1981	447000000
1982	428000000
1983	412000000
1984	363000000
1985	284000000
1986	259000000
1987	308000000
1988	272000000
1989	625000000
1990	570000000
1991	420000000
1992	375000000
1993	410000000
1994	405000000
1995	510000000
1996	555000000
1997	610000000
1998	470000000
1999	520000000
2000	668000000
2001	229000000
2002	178000000
2003	170000000
2004	337000000
2005	310000000
2006	467000000
2007	499000000
2008	813000000
2009	551000000
2010	710000000
2011	1044000000
2012	1005000000
2013	1150000000
2014	1997000000
2015	1687000000
2016	1302000000
2017	1089000000
2018	1143000000
2019	1033000000
2020	998000000
2021	1338000000
2022	1528000000
2023	1700000000