Year	current US$
1975	166400280000
1976	144099690000
1977	146737920000
1978	229760120000
1979	228320860000
1980	229491470000
1981	198051720000
1982	193984700000
1983	245274770000
1984	284185320000
1985	480938320000
1986	825067820000
1987	820018090000
1988	1042571570000
1989	1449605240000
1990	1303060910000
1991	1473420760000
1992	1284889370000
1993	1635284700000
1994	1872206510000
1995	2200120670000
1996	2686645230000
1997	3338366300000
1998	3180750370000
1999	5736265710000
2000	5542038650000
2001	4551143100000
2002	3690430290000
2003	5303126480000
2004	6080626920000
2005	6313411170000
2006	8672824250000
2007	10511166280000
2008	5190929380000
2009	6900113240000
2010	6705066620000
2011	5601539010000
2012	6333175460000
2013	7979084650000
2014	7232514050000
2015	6313031250000
2016	6371346756992.732
2017	8223952238357.222
2018	5831802504500.474