Year	current US$
1968	1900000
1969	-200000
1970	-300000
1971	200587.0521077923
1972	108571.7387763965
1973	0
1974	0
1975	3142703.608679698
1976	5772461.10745058
1977	17199128.581654683
1978	23913845.69984411
1979	-31145206.832838494
1980	49265731.45435693
1981	3786128.329863004
1982	48355925.163824745
1983	-15609726.04566563
1984	4868661.277377889
1985	29818854.36715973
1986	2740010.131415795
1987	-893524.0273015638
1988	12989265.94793426
1989	1784177.4601293106
2006	11600290.949797386
2007	20491630.938559845
2008	37666725.732364364
2009	41812039.21367816
2010	40562076.19935764
2011	27202770.584692985
2012	51183869.12088343
2013	58748662.30769707
2014	48483539.452240184
2015	23706011.561143313
2016	-107867689.042193
2017	103757505.67341183
2018	-61918950.952358946
2019	12034240.265613906
2020	-162374188.73333207
2021	35872051.76321694
2022	156655051.69666207
2023	-535657011.838758