Year	current US$
1970	749576001.118462
1971	1270410058.97693
1972	1847494921.75211
1973	3407139414.87953
1974	14813746720.3036
1975	12346353802.2105
1976	14783116223.4252
1977	15290288210.1978
1978	15759188243.0567
1979	15148222082.1252
1980	13063358608.6866
1981	10743304482.444
1982	10878044371.3631
1983	11039437954.0534
1984	10118618437.5091
1985	9814661863.73475
1986	3125471760.8496
1987	4503294693.80695
1988	4041271652.89851
1989	6938623310.17148
1990	9792336210.51938
1991	6323360690.36204
1992	6911347795.74243
1993	6691523735.49938
1994	6277323300.93707
1995	6693602943.65008
1996	8712094799.76828
1997	7340300181.53691
1998	4580582960.02062
1999	6644321828.03206
2000	11389644729.3731
2001	9333357545.50306
2002	6811252265.93086
2003	9339373918.39853
2004	13917865801.3384
2005	20532230984.0876
2006	23607897329.4019
2007	26023635922.1694
2008	35845051951.7267
2009	21078345282.0632
2010	25582070006.4361
2011	35072399672.1106
2012	25295554714.6002
2013	20800848422.9143
2014	20252842787.9139
2015	11380907167.8729
2016	13509388251.2477
2017	20647648500.1038
2018	26131625620.6266
2019	13442908843.7861
2020	8899254451.48472
2021	18088452353.9844