Year	2010 U.S. Dollars
1987-01-01	4020.58320615973
1988-01-01	4105.52074835393
1989-01-01	4243.77461395001
1990-01-01	3965.38272260404
1991-01-01	3624.29263348752
1992-01-01	3263.37185713051
1993-01-01	2797.56840598447
1994-01-01	2166.69302080634
1995-01-01	1917.45137153295
1996-01-01	1741.08871439694
1997-01-01	1704.31402365870
1998-01-01	1686.94178709922
1999-01-01	1699.51747282766
2000-01-01	1817.99710109357
2001-01-01	2005.31514152877
2002-01-01	2130.65855856673
2003-01-01	2349.93150771578
2004-01-01	2654.33354768562
2005-01-01	2746.04980202904
2006-01-01	2966.50006223766
2007-01-01	3220.01355748416
2008-01-01	3311.95840954095
2009-01-01	2834.34324513462
2010-01-01	2965.14236549771
2011-01-01	3138.46507001494
2012-01-01	3153.73924469198
2013-01-01	3160.08373580159
2014-01-01	3123.91557226248
2015-01-01	2828.88539029976
2016-01-01	2905.85744034369
2017-01-01	2991.62931126967