Year	constant 2021 US$
1970	20702939785.778534
1971	21091809525.638813
1972	18516209947.13903
1973	20953280150.987213
1974	25412159679.41284
1975	29652029630.221428
1976	28224149349.21265
1977	25041460611.609745
1978	25615640042.543427
1979	24269440122.414383
1980	28189930134.370937
1981	29551810045.298195
1982	27023929960.06087
1983	25734999797.916042
1984	25950589513.249718
1985	27483839666.02386
1986	24801109977.11123
1987	23802280284.53887
1988	23291040157.645958
1989	24302099883.426
1990	37996329659.74884
1991	43149319594.66079
1992	35975350072.04489
1993	33248190079.63875
1994	33669490165.710453
1995	32493580213.069923
1996	28992680007.45775
1997	26604889912.60531
1998	30022869947.671898
1999	33549049552.440674
2000	31977330132.48446
2001	32748919901.847855
2002	32730509875.29756
2003	32230570147.0934
2004	33779930377.8112
2005	51480149781.70397
2006	35034920134.78279
2007	32813630161.762245
2008	36131110370.63601
2009	29595719836.47348
2010	26886489846.22957
2011	29655819750.78584
2012	28878399908.900288
2013	31899099906.206146
2014	33498020376.50348
2015	33035269612.550755
2016	34948120250.46351
2017	33294120104.730145
2018	28559640001.29703
2019	25364910138.130207
2020	34609030038.3568
2021	37528649994.77941