Year	Current U.S. Dollars
1990-01-01	1614.640122399200
1991-01-01	1314.670670204040
1992-01-01	757.223548505358
1993-01-01	550.015542609224
1994-01-01	517.087087940892
1995-01-01	569.018138143296
1996-01-01	670.461104809102
1997-01-01	774.680203294323
1998-01-01	805.272684520598
1999-01-01	628.865651645466
2000-01-01	691.997710105302
2001-01-01	733.970396504250
2002-01-01	779.375683996206
2003-01-01	927.989197820003
2004-01-01	1207.388221633620
2005-01-01	1530.036418991800
2006-01-01	1872.680416067150
2007-01-01	2492.128779945270
2008-01-01	3174.949000686430
2009-01-01	2706.588511581730
2010-01-01	2964.477033730880
2011-01-01	3725.063221215920
2012-01-01	4142.869175365500
2013-01-01	4274.376857029610
2014-01-01	4429.650074514910
2015-01-01	3764.640911590370
2016-01-01	3865.785694124890
2017-01-01	4078.254879179120