Year	current US$
1970	75026627.3281197
1971	112042400.219469
1972	133763555.842463
1973	145982209.819662
1974	406792075.281481
1975	1307439117.07257
1976	1559037013.49084
1977	2526528623.74833
1978	3028786063.21816
1979	8743341426.41806
1980	11721664396.7315
1981	11937850125.56
1982	9386838815.07015
1983	11266730121.8475
1984	12217971228.8209
1985	12939952814.4887
1986	5463727257.36265
1987	7781254578.34948
1988	5682230014.79979
1989	6773175571.93484
1990	9776332006.06458
1991	5145415862.55398
1992	5218396159.54296
1993	5662712827.67762
1994	6329254148.79846
1995	8071697462.58598
1996	11001720258.1131
1997	8897261765.07821
1998	2507058936.05493
1999	7188870174.00434
2000	15975092378.3244
2001	13954669060.8149
2002	13145298158.9978
2003	14168806114.1805
2004	16120897994.0442
2005	19089478958.8139
2006	22156640345.5182
2007	23782526659.3176
2008	35492289836.4734
2009	18595050232.2798
2010	19381330977.2215
2011	25143571595.096
2012	20117492710.16
2013	16879608444.4001
2014	14796719129.0093
2015	8697952772.16075
2016	6527949562.84407
2017	9409452364.27835
2018	15941882502.6996
2019	13930965546.727
2020	6878456025.32492
2021	16225670088.6611