Year	current US$
1970	405898790.382012
1971	423517259.364934
1972	563194823.464375
1973	793080573.506305
1974	881079150.827877
1975	1194974193.13275
1976	1457021129.82771
1977	1763573381.60694
1978	1999357824.26136
1979	2717204414.18553
1980	3537538024.29858
1981	3469547814.74923
1982	3929057060.40996
1983	4453830067.862
1984	4663074800.1949
1985	5538019107.96342
1986	6698202662.68518
1987	6871111889.09286
1988	5631985916.59256
1989	3793574057.53594
1990	4057588341.07062
1991	2789051538.41219
1992	2383869539.28126
1993	3954985845.91893
1994	3275104198.179
1995	2816732634.84368
1996	3479778138.84208
1997	3181614220.13538
1998	3623213349.40607
1999	3920777522.19168
2000	3488988885.16827
2001	3716413733.04409
2002	3753058066.92636
2003	4435386069.67036
2004	5594324560.49231
2005	6454063443.22554
2006	6958047325.40186
2007	8327528909.42137
2008	9906982986.14887
2009	9861920252.6065
2010	9807725615.10317
2011	11314572330.9794
2012	11564282243.7643
2013	13262809854.3411
2014	15975077502.0398
2015	14322109840.5105
2016	13176630163.6377
2017	14597552081.6567
2018	14195046383.1009
2019	14918040143.8398
2020	12799143669.0556
2021	13303643690.8006