Year	current US$
1971	1590958706.46651
1972	1933927417.31125
1973	2236930754.6755
1974	2780074463.7136
1975	3426357287.32387
1976	3758628146.2022
1977	4295104423.28412
1978	4567055063.25212
1979	5292195441.73343
1980	6083575411.01046
1981	6618066938.2651
1982	7335775416.51628
1983	7905573165.85743
1984	9457046565.91146
1985	4491920785.71038
1986	5605452843.11443
1987	5260422814.3803
1988	4755276161.86447
1989	6025098644.4135
1990	6425525642.37007
1991	8971386840.70361
1992	10717172635.0806
1993	11789814137.9267
1994	13341725435.0755
1995	15042660983.8977
1996	16731556708.445
1997	18486533306.1171
1998	20146523109.3453
1999	20424265382.8663
2000	22349924333.7507
2001	23684255229.2454
2002	25020066248.5689
2003	18781879302.7671
2004	19114964880.5433
2005	32043153244.2288
2006	33902263007.1408
2007	39148811591.5892
2008	44369979575.3469
2009	44550379426.5526
2010	49567929741.6196
2011	53219573896.8496
2012	55575112510.4798
2013	56447619101.4469
2014	60364395092.0419
2015	64844273923.5408
2016	68597038095.9072
2017	71762027828.5363
2018	76696510021.9462
2019	79201784818.0885
2020	69503723948.3004
2021	81914377873.2875