Year	current US$
1970	491069037.244763
1971	767329160.407206
1972	792785837.382295
1973	1478283229.30539
1974	7071506882.06731
1975	4976317193.46235
1976	5117631643.79171
1977	4055007393.46709
1978	4179004790.8912
1979	12024669655.5562
1980	13052483634.2394
1981	10320446069.6478
1982	4714981997.72737
1983	5851855125.92556
1984	5520485510.39875
1985	2794597391.74309
1986	1345382602.37817
1987	2125875800.35444
1988	1725813625.90737
1989	2609421192.02255
1990	4417394941.01259
1991	2878333677.91465
1992	3080832499.85244
1993	3143173332.17899
1994	3192538794.08715
1995	4198243580.74978
1996	6235659821.7616
1997	5865130112.04636
1998	2972278867.53869
1999	4473378929.33934
2000	8498919569.72378
2001	6829364468.72952
2002	6021701809.95632
2003	5718832952.50637
2004	8922806400.19029
2005	14378571802.7743
2006	16035444762.7891
2007	14081062039.1195
2008	12504184118.5169
2009	4377336932.59926
2010	4306252667.05809
2011	6924217452.90402
2012	6337574801.67112
2013	5749995583.78623
2014	4828009364.62445
2015	1798306341.76187
2016	1105204467.92124
2017	1210005872.70244
2018	1110456652.48287
2019	440059615.982469
2020	78057687.7656313
2021	241286036.047927