Year	current US$
1970	661929529.992811
1971	714825225.427286
1972	848083940.079237
1973	1026780449.96477
1974	1126226194.65412
1975	1674113292.00885
1976	1615529092.51791
1977	2142746701.89606
1978	2651989513.78922
1979	2656335298.6744
1980	3848878886.41133
1981	4596987369.90943
1982	6754574214.64079
1983	6198977384.16232
1984	5917463091.95838
1985	5428995475.08986
1986	3629680283.44745
1987	3216842603.88191
1988	3243840424.02277
1989	2816880625.68043
1990	3304328078.15248
1991	3761380832.83016
1992	3846179933.18102
1993	3344191579.67031
1994	3522453474.98872
1995	3894257267.72397
1996	3941815622.91363
1997	4150801953.12252
1998	4694685892.5284
1999	5068985751.02665
2000	5792088257.18666
2001	6649991378.29901
2002	6718235075.88289
2003	8170240656.8257
2004	10334003547.4341
2005	11329885626.3585
2006	12450732377.4912
2007	15367598680.8127
2008	20598035123.1771
2009	13047134054.9254
2010	15391908517.3688
2011	14457056018.6272
2012	16101426295.7009
2013	18463559179.3661
2014	21123800416.4071
2015	22203894537.2528
2016	19093348522.4163
2017	19697074401.5388
2018	18687632926.4988
2019	18445359299.5467
2020	16940185487.6064
2021	20708680377.9956