Year	current US$
1970	2130063.29337672
1971	1342299.26651795
1972	1298093.21443653
1973	1303721.39997884
1974	12239614.7123603
1975	4219586.28434127
1976	15465444.9848176
1977	36234822.9208363
1978	45242145.3849878
1979	64919582.9646946
1980	75546439.4366457
1981	43222569.7456419
1982	30799126.7140285
1983	33428865.7719914
1984	27756136.8880426
1985	25130825.528806
1986	22387817.7945895
1987	30504000.5680728
1988	37934261.5300892
1989	39376032.1403137
1990	37430984.0120148
1991	14184850.9252051
1992	11598764.5820247
1993	6341030.88153035
1994	20349444.5390175
1995	25897858.2780993
1996	14904633.4861328
1997	14956170.5906472
1998	9423515.44327996
1999	6214528.6220862
2000	6439951.89840817
2001	5728788.23870108
2002	10944034.2127297
2003	11258862.5949847
2004	11438419.3456611
2005	16730317.8890138
2006	23216810.9489556
2007	26841123.9902661
2008	31141177.9950639
2009	33035604.2221716
2010	91746475.6501079
2011	200592338.31618
2012	232352262.187027
2013	208656083.616574
2014	120017702.303815
2015	410150006.514917
2016	29738636.7429998
2017	48688522.6320598
2018	6385447.47295566
2019	0
2020	0
2021	0