Year	current US$
1970	3152405.474384
1971	2404001.83868282
1972	2731824.98570609
1973	6065359.7213674
1974	11854099.3836213
1975	3791668.0236719
1976	5255170.50945958
1977	6940327.05805899
1978	6401029.93680683
1979	13366439.4050908
1980	38038020.3191773
1981	6176949.45695242
1982	4896333.90027951
1983	6496663.59817398
1984	4879271.91538431
1985	4037599.34280043
1986	3459578.26193401
1987	4714361.74984469
1988	9406452.68963797
1989	10839211.3280684
1990	6039898.95400237
1991	3550413.02639479
1992	5790759.28640233
1993	3352154.56099959
1994	24347848.4316546
1995	17570377.2776716
1996	16857524.7476188
1997	6359251.55217585
1998	2972483.46822978
1999	5009215.63677
2000	3849159.71218249
2001	3653645.65041192
2002	7169659.53684485
2003	4876129.36047061
2004	2474958.87121064
2005	3739774.97076511
2006	7811609.80781236
2007	9270686.96611479
2008	15215143.8580967
2009	20134796.3828499
2010	24241961.3725318
2011	2583086.31153034
2012	1916898.0897004
2013	1078719.86474023
2014	796421.942107493
2015	24879.5025488653
2016	27501.7089050666
2017	47209.7160214233
2018	93608.9302695021
2019	0
2020	0
2021	0