Year	current US$
1975	7832161684.72449
1976	8761535152.71418
1977	7417289953.50247
1978	8700445591.37367
1979	16682023156.7052
1980	18997065657.3218
1981	17030714728.1419
1982	9423291050.58475
1983	9670178877.20774
1984	10326834919.6805
1985	8092054526.41591
1986	8864154020.39955
1987	10123931818.8379
1988	8594241774.13613
1989	11061308118.0786
1990	2270260101.18346
1991	-27657027794.1112
1992	2993717221.95381
1993	5728480793.8652
1994	5740683577.92297
1995	8092930719.02358
1996	10568272492.5163
1997	10941092904.0764
1998	4824093487.85438
1999	7618629836.11559
2000	16228648698.8365
2001	10214731438.1982
2002	6716304040.2611
2003	12844248931.1356
2004	24883746833.0395
2005	42425169913.9226
2006	62483745755.2879
2007	58703109275.7808
2008	77304550182.1642
2009	36484689089.47
2010	50402898323.092
2011	78347446953.0241
2012	88075326046.3907
2013	84682732889.958
2014	71179679583.03
2015	25624568104.1511
2016	17833158725.7145
2017	32287856341.4198
2018	43791527634.7284
2019	32126537266.9285