Year	Current U.S. Dollars
1980-01-01	297.618882949593
1981-01-01	291.525391680760
1982-01-01	291.087212787433
1983-01-01	255.688498127679
1984-01-01	262.659868911038
1985-01-01	343.199456635921
1986-01-01	402.565450484003
1987-01-01	180.795824720161
1988-01-01	161.012354547305
1989-01-01	177.199729213506
1990-01-01	189.624538216333
1991-01-01	240.124274697301
1992-01-01	162.826959820363
1993-01-01	163.614393660182
1994-01-01	161.704880904404
1995-01-01	160.017617695495
1996-01-01	216.875428347935
1997-01-01	253.109647779986
1998-01-01	284.373291018735
1999-01-01	301.539471988763
2000-01-01	277.648659095599
2001-01-01	256.441487198413
2002-01-01	262.884055131003
2003-01-01	283.891158779196
2004-01-01	336.331814516981
2005-01-01	369.154535872339
2006-01-01	385.756714147082
2007-01-01	422.146157334164
2008-01-01	503.127710872855
2009-01-01	463.852617981066
2010-01-01	419.225814942685
2011-01-01	526.531351664068
2012-01-01	566.051387255338
2013-01-01	605.985608081366
2014-01-01	623.286753930288
2015-01-01	528.312559745128
2016-01-01	382.069457028432
2017-01-01	415.717716654351