Year	current US$
1978	-100496300.480197
1979	36748002.8638885
1980	220975033.590907
1981	261062097.312469
1982	543887670.082886
1983	399972740.839198
1984	437885989.875157
1985	114999254.45661
1986	-149495775.847762
1987	-51982205.13138
1988	-456591678.304146
1989	-247453283.478684
1990	200400323.73298
1991	-206106363.191396
1992	221546446.062223
1993	-94202175.3576233
1994	74547225.8154235
1995	-585528326.210918
1996	-639313100.588494
1997	-352046523.337291
1998	-368724948.762934
1999	-162681933.295852
2000	389299582.19565
2001	-79846655.7332565
2002	-46911037.3031448
2003	188404394.429155
2004	-367175571.258713
2005	588123138.776147
2006	1453942725.73971
2007	812787491.959493
2008	2247225802.03395
2009	1446332833.69405
2010	3841899991.8811
2011	3958901817.01159
2012	5785101554.0486
2013	5833833446.53829
2014	5714490986.05567
2015	1630658621.22696
2016	-158763114.080438
2019	1373046296.30266
2020	-938810797.333755