Year	current US$
1970	18230000
1971	33189999.999999996
1972	48750000
1973	116670000
1974	392530000
1975	669820000
1976	667320000
1977	874570000
1978	947340000
1979	1246450000
1980	1731960000
1981	2288210000
1982	2682510000
1983	2492300000
1984	2748160000
1985	3152722170
1986	2560792288
1987	1958765873
1988	2201492715
1989	2257511547
1990	2726418726
1991	3193974440
1992	3770182645
1993	4115553223
1994	3915010082
1995	4253439741.9999995
1996	4605180444
1997	5021046441
1998	5681516765
1999	4674333752
2000	5039286834
2001	5797661820
2002	6004805857
2003	6363677022
2004	8612942592
2005	8823465085
2006	10893397628
2007	15970991509
2008	22923124469
2009	17844322181
2010	19773666648
2011	23618643874
2012	28117165074
2013	34332982022.999996
2014	29304089304
2015	29006951970
2016	23110774788
2017	26517630440
2018	25347325558
2019	22191802130
2020	20181172217