Year	2010 U.S. Dollars
1987-01-01	2789.78187044701
1988-01-01	3020.56864509290
1989-01-01	2817.85675144787
1990-01-01	3713.35617421929
1991-01-01	3443.98162335797
1992-01-01	2845.45805844167
1993-01-01	2808.24852807561
1994-01-01	2263.55634511393
1995-01-01	2054.28248952347
1996-01-01	2151.27256388421
1997-01-01	1876.36776188972
1998-01-01	1983.01543617205
1999-01-01	2282.97592238408
2000-01-01	2381.17572965515
2001-01-01	2458.50768000309
2002-01-01	2440.27734550907
2003-01-01	2495.28835659182
2004-01-01	2593.51525381597
2005-01-01	2900.12255413331
2006-01-01	3181.07379427164
2007-01-01	3489.33006163966
2008-01-01	3949.04823365650
2009-01-01	4129.54353076907
2010-01-01	4439.20300021757
2011-01-01	5006.29623210365
2012-01-01	5462.98054873965
2013-01-01	5909.77104296775
2014-01-01	6399.27066175581
2015-01-01	6693.93561006515
2016-01-01	6986.85594417965
2017-01-01	7317.54950612294