Year	current US$
1977	300878755.002561
1978	151288183.521181
1979	-14158155.2769887
1980	-118057655.882316
1981	-29420520.6764756
1982	-98074562.7003711
1983	-68835703.4586643
1984	-629270202.575215
1985	-48714178.1466479
1986	628107913.386617
1987	537413283.759691
1988	633809109.922788
1989	415277896.005026
1990	-845886025.997646
1991	-2330576538.25952
1992	-55150571.7982071
1993	-185045607.128164
1994	82500152.5201857
1995	-313361973.819682
1996	-723679483.211454
1997	-27155851.5830178
1998	99146227.1714821
1999	-34471955.2363362
2000	1123707657.38813
2001	2491675106.30074
2002	2784411215.10489
2003	3661019409.14821
2004	4985323685.83873
2005	4550918611.72683
2006	6122019391.24258
2007	10040174156.993
2008	11867884830.0973
2009	14202474137.6494
2010	12390561255.3328
2011	8578858710.93616
2012	6093632906.01808
2013	8429482137.29441
2014	21638973640.6494
2015	24139026537.469
2016	28063526339.3132
2017	37988552274.6672
2018	7775195882.5101
2019	8922378202.34942
2020	6287447781.39787
2021	-5165840.81373549