Year	current US$
1970	796889714.9938042
1971	-1117468789.0137327
1972	-1774764276.2284193
1973	982484224.5101296
1974	5032706162.548378
1975	-4701607354.685646
1976	3706113049.5464063
1977	-679563309.1946456
1978	-599545973.0778005
1979	960118853.4141226
1980	5193900067.827267
1981	-4155382388.0088573
1982	-2009355762.3478882
1983	-2657057623.6613975
1984	2407901697.1567116
1985	3662359801.237197
1986	1303448499.8051693
1987	4492960860.472065
1988	5444669741.148468
1989	3090673158.3403893
1990	3522710084.033613
1991	4209965662.5565786
1992	3553753338.570307
1993	140087363.11061892
1994	2490437079.731028
1995	7867229288.006656
1996	2072405571.5899107
1997	4172919508.8676667
1998	3141407382.625181
1999	4411994761.274141
2000	1533935721.411768
2001	1428349970.5511827
2002	2653563545.843142
2003	4796911875.019598
2004	5389331176.911211
2005	-2086463795.7976644
2006	7354544548.941166
2007	12957458717.372591
2008	12058577012.734373
2009	-13238298400.742178
2010	11867550456.666689
2011	17309241961.089527
2012	-10842845517.421877
2013	-6686941515.647078
2014	5124691775.490178
2015	3155343709.648436
2016	7321167878.63815
2017	11246879856.705902
2018	14252821883.37254
2019	5037075556.862737
2020	-5088483665.369664
2021	28593811462.40264
2022	29547597042.218014
2023	-5666820749.607944