Year	current US$
1973	0.22602955961490395
1974	81.71417978555861
1975	36.45643510394322
1976	58.527662157739826
1977	46.78577074634841
1978	47.164384040406766
1979	40.89837748801955
1980	144.09355728117896
1981	88.00316558540196
1982	74.77683898873019
1983	66.43192309169132
1984	85.18168700084544
1985	105.59035234588887
1986	131.5381180950092
1987	179.0133793705731
1988	340.98884713796616
1989	327.8688422224654
1990	199.82281439017325
1991	185.24000367228652
1992	197.31050598592228
1993	259.8499398693198
1994	147.8536234410364
1995	91.65687650687262
1996	158.47970679411677
1997	165.61297459853148
1998	151.25480572508388
1999	106.19074687968411
2000	87.7675372195231
2001	220.2844368816792
2002	607.3837191222052
2003	1.9383602243388836
2004	-1.7174752729038365
2005	55.858745748439375
2006	111.5757140221336
2007	74.01893053437179
2008	994.571242808527
2009	68.73070253351943
2010	242.17875540021308
2011	331.22465330450814
2012	455.5073600083433
2013	629.0953846182616