Year	Current U.S. Dollars
1990-01-01	1237.324491677000
1991-01-01	1209.237492849590
1992-01-01	676.151511452520
1993-01-01	530.090379806798
1994-01-01	436.190558581990
1995-01-01	397.198116117247
1996-01-01	409.216745216782
1997-01-01	505.560573228931
1998-01-01	561.910301735455
1999-01-01	573.890256172100
2000-01-01	655.097432602586
2001-01-01	703.683843432722
2002-01-01	763.073085847085
2003-01-01	883.643996547170
2004-01-01	1045.021629870020
2005-01-01	1578.402390296030
2006-01-01	2473.081818635360
2007-01-01	3851.437868711720
2008-01-01	5574.603802186130
2009-01-01	4950.294791423750
2010-01-01	5842.805783585760
2011-01-01	7189.691229207650
2012-01-01	7496.294647682630
2013-01-01	7875.756952542880
2014-01-01	7891.313147499860
2015-01-01	5500.310382444080
2016-01-01	3880.738730895560
2017-01-01	4131.618310050550