Year	current US$
1970	7844147.21616811
1971	7468516.41312213
1972	6233432.22234393
1973	6533935.58273934
1974	11408340.8383109
1975	15895884.5189268
1976	18461246.4394532
1977	14654066.6059433
1978	10476824.7003288
1979	13257726.2548437
1980	19009938.2832241
1981	18034313.9183985
1982	17694308.8718241
1983	12713596.285172
1984	15131718.7481478
1985	17123953.7200001
1986	15749532.5814704
1987	16788401.2499483
1988	16691428.970909
1989	20755917.8537052
1990	28654765.4359991
1991	36380617.9565195
1992	28193991.296952
1993	23598115.4316324
1994	65747524.6484254
1995	51996505.1624806
1996	71368610.8483637
1997	67920950.424574
1998	30640809.7858984
1999	17178503.2223204
2000	25021831.2097529
2001	21319113.777578
2002	39587970.1352575
2003	90618909.8813251
2004	154782891.627614
2005	278645552.540402
2006	464227193.130936
2007	625304668.129379
2008	438039643.511597
2009	212128875.874031
2010	282389451.888586
2011	366989531.153089
2012	154277155.590331
2013	122534723.588265
2014	68680056.1800382
2015	25258643.3758152
2016	32869922.8646783
2017	41937549.4928664
2018	446733.171699205
2019	0
2020	0
2021	0