Year	current US$
1975	13677216371.1618
1976	13399200675.2542
1977	15419098844.9197
1978	16888753839.13
1979	16571345177.3287
1980	15057993996.2219
1981	18900735896.26
1982	10492804537.5473
1983	2850202532.69758
1984	9175019715.76667
1985	13897283192.4026
1986	14306380033.5962
1987	26245037349.8543
1988	34642205253.8153
1989	80011667969.7961
1990	19765925970.8387
1991	18135017140.4269
1992	21220952198.3228
1993	25132317216.3255
1994	33885524911.122
1995	19792383024.9883
1996	26541317959.2587
1997	15503207909.0736
1998	6374535778.87646
1999	-8215236198.33904
2000	-690814714.512314
2001	-4144320274.91772
2002	4836214581.50136
2003	9113911338.58687
2004	29607609619.5111
2005	33198616368.4141
2006	49584264770.6466
2007	77834174154.0649
2008	81886568952.8896
2009	-5257774681.34155
2010	8206443963.81409
2011	-3243015212.71088
2012	-79685058125.4957
2013	-69072998481.6622
2014	-122491307311.938
2015	-142257575843.125
2016	-164337426140.735
2017	-155069080769.928
2018	-145150637606.195
2019	-146876232962.448
2020	-66603631934.5041
2021	-15896717478.624