Year	current US$
1971	662883511.582029
1972	769309778.955719
1973	927788895.141
1974	1175648982.43421
1975	1347978353.70734
1976	1657643018.9216
1977	2044099496.95921
1978	2538565335.067
1979	3192414807.88966
1980	3780889297.35035
1981	4264602378.06534
1982	4509273891.87471
1983	4703981843.3301
1984	4625618598.84518
1985	4547605284.66842
1986	5833746748.22941
1987	6060380721.37822
1988	5501986251.20582
1989	3701381028.54065
1990	3648438446.68665
1991	3608194714.52464
1992	4594993866.02676
1993	4914469850.02388
1994	5490530292.72761
1995	5975491632.66706
1996	6110148641.55033
1997	6444808276.43567
1998	7109861378.9277
1999	7285849597.99189
2000	7881151968.49301
2001	8417076050.89765
2002	8904905450.64671
2003	9593059954.24939
2004	10875949293.0733
2005	11973891981.926
2006	14471006387.6034
2007	16459076568.9094
2008	21259935250.6207
2009	22920035692.5398
2010	24873719888.7446
2011	26958672173.1555
2012	28928339966.039
2013	31763714545.4757
2014	33914318782.448
2015	35475271836.3985
2016	36550861193.924
2017	38928749591.575
2018	40724060108.9215
2019	42516475725.5879
2020	41896497953.5973
2021	43544134322.3639