Year	current US$
1974	37777276.0954861
1975	37981522.8564164
1976	37297734.3785254
1977	63012802.8906657
1978	42805260.2313286
1979	81526056.3413226
1980	-21936560.5283724
1981	-105663181.409605
1982	81221415.4566457
1983	7822720.5101914
1984	4532980.1792441
1985	-38386007.7151969
1986	-36673652.273516
1987	-48410196.2646531
1988	-110282204.940918
1989	-63289667.634588
1990	11218456.476195
1991	20806676.6170444
1992	-21499343.7051556
1993	-58560902.5060369
1994	-9811864.33070594
1995	-1101924.94722939
1996	-47421407.3363709
1997	-15177544.7889422
1998	-27043957.3538631
1999	-143223352.263423
2000	-96001488.4325908
2001	-58386545.8995766
2002	-18253482.4712801
2003	-125258800.711782
2004	-8870010.50414503
2005	-54838670.2512867
2006	-30593895.8449186
2007	122330581.209077
2008	-26066086.9842315
2009	-193263644.81572
2010	-207038799.150051
2011	-101273831.677604
2012	191423646.983712
2013	715751879.328664
2014	1113163892.2301
2015	498053400.091765
2016	946405625.445583
2017	947674049.134898
2018	1374653662.29953
2019	1647037512.00935
2020	1682051128.74922