Year	current US$
1970	127249532.403246
1971	136942721.589523
1972	121710023.810201
1973	163173532.950699
1974	213882266.042144
1975	263244133.691549
1976	473636729.423042
1977	867122744.298866
1978	1066028228.70105
1979	1268887938.62551
1980	1466383619.67972
1981	1654843101.98588
1982	1422234906.59949
1983	1440666473.2256
1984	1524602188.3608
1985	1225859247.55368
1986	1477780885.9401
1987	1839373412.48728
1988	750564228.401368
1989	777578415.276441
1990	897628643.293666
1991	1248851958.22099
1992	1245047715.74809
1993	1585657257.24623
1994	2096770581.23459
1995	2231678426.71667
1996	2933988797.51169
1997	2705142727.24035
1998	2902054763.32694
1999	3137318313.06095
2000	3489294143.38442
2001	3526805540.00263
2002	3687647145.4631
2003	3925883361.08224
2004	4552067952.24982
2005	5544610387.96824
2006	6336492153.40183
2007	7240550951.37859
2008	8682726236.13798
2009	8954497135.14254
2010	10709040396.8267
2011	3296705637.78004
2012	3983035080.70802
2013	2578011492.26749
2014	2153297842.59129
2015	1550173213.56134
2016	862859372.065801
2017	987581417.379992
2018	1139061376.90631
2019	961554471.13468
2020	379989515.846591