Year	current US$
1970	13531901.0116073
1971	17056207.9161241
1972	78742524.4919672
1973	348936868.595771
1974	2615036905.21323
1975	2655622775.89544
1976	3609864798.645
1977	4761385874.30616
1978	4624224933.99074
1979	11048823356.3442
1980	12867809496.903
1981	11042834279.1452
1982	5854415480.08278
1983	6978299541.55599
1984	7749161920.80826
1985	7181155489.60124
1986	3835673414.75981
1987	5296529387.04727
1988	4032960938.72461
1989	6929003833.80857
1990	9408705433.30281
1991	6216322167.12357
1992	6678207805.52737
1993	6763149248.43853
1994	6301532893.44783
1995	6707612013.75091
1996	8340438629.2913
1997	7385398984.234
1998	3915878827.01753
1999	5996691393.81654
2000	11480914881.8454
2001	8472292493.4668
2002	8007029088.55422
2003	8899806200.64367
2004	12840537861.6091
2005	16700310419.3488
2006	17879565294.1056
2007	18338597092.3288
2008	30055140826.1356
2009	15040349599.9343
2010	23955517485.2348
2011	37798087914.5592
2012	29654962719.9384
2013	25180839447.2361
2014	22815309138.1488
2015	12565557736.0524
2016	11012052868.561
2017	14458016893.6381
2018	20822237837.8443
2019	17910552602.5881
2020	10635507127.8332
2021	22841182662.4667