Year	current US$
1975	160100280000
1976	136699640000
1977	134356990000
1978	214400850000
1979	212455020000
1980	211038670000
1981	174663400000
1982	169842630000
1983	204472800000
1984	250923140000
1985	428546280000
1986	744350970000
1987	729300540000
1988	916012490000
1989	1290142470000
1990	1171983670000
1991	1331572960000
1992	1174321400000
1993	1493088390000
1994	1699810800000
1995	1957540390000
1996	2352556360000
1997	2956931490000
1998	2771775000000
1999	5224959550000
2000	5060362560000
2001	4194131160000
2002	3379726730000
2003	4817259350000
2004	5789489000000
2005	6130977120000
2006	8402108760000
2007	10132127560000
2008	5016706270000
2009	6697388940000
2010	6465074940000
2011	5422244640000
2012	6135006900000
2013	7730170410000
2014	7026718300000
2015	6139035610000
2016	6192029627911.31
2017	7967384308357.222
2018	5578917014500.474