Year	current US$
1970	81889.6573941536
1971	223107.461141447
1972	690779.791053823
1973	2310483.10997474
1974	1708629.19765221
1975	1809904.19704315
1976	1096244.1032904
1977	670263.992284886
1978	1060834.04575903
1979	2649989.31375567
1980	2384147.30337985
1981	1108960.47529654
1982	411859.50640153
1983	182873.631647264
1984	67359.1858769674
1985	182762.981637367
1986	236021.083849771
1987	640995.016284622
1988	6043906.40798803
1989	906117.758554158
1990	1903593.85168608
1991	4969851.26947109
1992	1019399.52041581
1993	579344.736257072
1994	2806585.03847742
1995	636514.349755904
1996	1913206.07893666
1997	6489449.96551634
1998	13999.6250090463
1999	9153.87880456439
2000	15061.2159418425
2001	13994.2099141173
2002	25249.4570368532
2003	9228.13323823718
2004	139244.549233096
2005	167594.037093634
2006	388689.814862766
2007	438991.465049864
2008	553545.245751502
2009	674791.86973107
2010	1363843.73505886
2011	2353681.56923515
2012	2216136.69689542
2013	1493470.22225599
2014	1219857.76770599
2015	920062.928839796
2016	1182753.5636495
2017	958571.368218243
2018	0
2019	0
2020	0
2021	0