Year	current US$
1990	2799644914.98423
1991	3156459911.15614
1992	3693197277.5563
1993	4004150569.60025
1994	4555484158.27698
1995	9057922875.84005
1996	9047482889.93382
1997	8443241190.75181
1998	8671020249.80396
1999	8697486121.67949
2000	8453939266.33045
2001	8364876168.94369
2002	9171082686.53982
2003	11637327213.3776
2004	13047101080.0487
2005	13270157315.6694
2006	13917862196.2415
2007	15809180943.7727
2008	18362264362.1142
2009	17369409611.4445
2010	16563257447.2643
2011	17744201531.0979
2012	16666560024.8788
2013	17627351052.0618
2014	17765136284.4549
2015	15155862872.6957
2016	15471165988.4895
2017	16412378663.1418
2018	17896744411.5936
2019	17797143797.0608
2020	18734709482.9283
2021	20355863164.189