Year	current US$
1970	221658370.381957
1971	258692988.065748
1972	323489180.728175
1973	398387235.197551
1974	356811083.032956
1975	528487896.748854
1976	489408744.861314
1977	487215112.807003
1978	524875899.026788
1979	614196023.286141
1980	944273909.570173
1981	1357474411.80279
1982	1555999269.33518
1983	1250849599.70445
1984	1218925765.83656
1985	1179551364.6986
1986	1191583487.29814
1987	1311540530.83142
1988	935786597.298938
1989	709721120.718004
1990	659261557.985812
1991	1028830643.0739
1992	1151107944.54599
1993	753674802.19055
1994	560584072.511058
1995	62616608.295759
1996	97236190.9131612
1997	300251856.738877
1998	528767129.76986
1999	362242852.845356
2000	15236965.644917
2001	246167708.893653
2002	342230419.082426
2003	701379337.377744
2004	690395761.296874
2005	1204003946.71109
2006	1778372733.0016
2007	2410182048.24309
2008	3130268209.08301
2009	3998266872.46529
2010	4671481925.02766
2011	4313451261.70419
2012	7148510730.53889
2013	9359125543.7108
2014	10582569517.2654
2015	7462515048.91931
2016	6067304277.32603
2017	4601505141.76886
2018	5682663573.28899
2019	4885911327.03531
2020	4395300328.04158
2021	6299969558.00895