Year	current US$
1977	629195060.4982167
1978	552119024.3102877
1979	436996267.3152531
1980	366190375.45685
1981	497387063.89107126
1982	344384576.97298825
1983	408296176.89096874
1984	-56384615.384616464
1985	366437642.701554
1986	1109336140.76
1987	1109231522.1944435
1988	1304288888.8888893
1989	1431324748.0666683
1990	693533333.3333334
1991	-384232144.9108726
1992	268436718.94244194
1993	272580304.3047064
1994	739337501.2516876
1995	433889775.7517121
1996	65550726.89943652
1997	830176792.7257174
1998	955607310.9367989
1999	706566003.77588
2000	2210677769.351185
2001	4500314477.65596
2002	5676494495.951096
2003	6812192939.826823
2004	9847180851.282452
2005	12409033621.32159
2006	14668302106.324018
2007	22521378915.093136
2008	21874736000.42691
2009	12262918565.563084
2010	16569010620.676226
2011	15825383574.136599
2012	3746924497.901921
2013	4274922315.9355574
2014	4454989094.930548
2015	4193077973.684529
2016	4055309979.662262
2017	3888168517.0667887
2018	-379231100.4393996
2019	1653448286.8078747
2020	1257182553.587779
2021	2300097295.8547745
2022	2578498907.567489