Year	current US$
1970	2506130.36917668
1971	4115187.15028932
1972	4901225.84137798
1973	8807128.93120832
1974	50889692.316881
1975	51807575.6051328
1976	58219434.0887795
1977	47434447.6736147
1978	53039730.4979749
1979	140075787.211077
1980	179908191.91319
1981	203728934.140857
1982	90760963.7656536
1983	109640818.564402
1984	105169996.526446
1985	93263824.2402315
1986	33961494.399466
1987	78761987.4277088
1988	45442723.053384
1989	62803180.8408075
1990	72395392.5001273
1991	33818800.623384
1992	30592628.0878922
1993	27570219.5602604
1994	23457403.1478272
1995	20084898.4339215
1996	19927369.3793421
1997	14400783.5587273
1998	12843886.3064101
1999	21836887.782121
2000	37054282.214629
2001	32844292.470541
2002	26609944.4877019
2003	21620380.4722101
2004	24179674.8961358
2005	35645463.1061535
2006	35424741.3273634
2007	36463597.3444156
2008	47935088.1084839
2009	48209234.3531087
2010	34361734.5692331
2011	50075060.2431423
2012	53846809.33054
2013	56292197.5370206
2014	37614830.1167268
2015	16502811.3511753
2016	12902832.2814086
2017	16648618.015569
2018	32106738.5615307
2019	41070008.5040137
2020	15822716.9386005
2021	30654961.8372328