Year	current US$
1970	3534727202.12677
1971	3436762067.97462
1972	3627600670.45556
1973	6226162329.88815
1974	8532329880.9569
1975	5719264994.59612
1976	4566056768.40321
1977	4848051184.20169
1978	5532883034.93297
1979	7569092664.84066
1980	14106197042.0421
1981	10661359986.177
1982	6165200375.32492
1983	5553968331.18598
1984	4201065305.8143
1985	2541834878.94172
1986	1209045321.22031
1987	622085789.718218
1988	1303333540.9278
1989	2401651811.40516
1990	-2194297885.91973
1991	-919428081.49926
1992	-298836467.975521
1993	2379395344.47751
1994	2236235178.14283
1995	5346504863.13116
1996	3887047159.46548
1997	2770045390.1768
1998	1890928447.25482
1999	952213594.348297
2000	2537780372.07568
2001	1855297496.08998
2002	6158904074.34506
2003	10844283214.413
2004	12153814151.5545
2005	16372874974.006
2006	17585465340.602
2007	15011781828.7285
2008	9632434803.95691
2009	12010041606.8913
2010	16505886542.2853
2011	14694312903.6423
2012	1553133919.42967
2013	777730306.95916
2014	-467664888.781769
2015	1564143792.86934
2016	359996175.853699
2017	1972161317.64182
2018	-2606150909.52674
2019	-2947672832.35482
2020	-2917788627.77679
2021	14437137581.2356