Year	current US$
1974	1359164566.19484
1975	892469077.407285
1976	1990255786.80424
1977	2272891077.22134
1978	2883181580.04855
1979	4995019999.63979
1980	4763553913.52098
1981	3694991313.20531
1982	3419553955.56479
1983	4477824934.32433
1984	5704446189.18321
1985	3763299001.49366
1986	2785168378.66373
1987	5257000281.65547
1988	6349172205.1305
1989	6900494458.27116
1990	7781755596.41029
1991	7980735852.84951
1992	10705834720.9239
1993	13742208038.4394
1994	15165806777.9917
1995	16552303092.95
1996	20981810057.091
1997	19916021577.5985
1998	13132847653.2798
1999	13975016399.0284
2000	17191220250.487
2001	13055903314.7536
2002	15455134555.898
2003	19754541291.3927
2004	24023380704.8991
2005	31213965000.7572
2006	38151352844.6645
2007	45944627406.5749
2008	54588448875.57
2009	33457339183.893
2010	42267158460.4481
2011	52892746470.4918
2012	45773419365.7345
2013	40064511342.0722
2014	38457296439.3546
2015	28542024824.4289
2016	26290755585.5202
2017	26911035969.4827
2018	21175968625.8662
2019	15636454197.991
2020	11460041901.7225
2021	20139904240.3498