Year Current U.S. Dollars 1984-01-01 662.520052309521 1985-01-01 662.914792567596 1986-01-01 719.157295703914 1987-01-01 699.384292086697 1988-01-01 676.566732520011 1989-01-01 723.409610237851 1990-01-01 639.463899289892 1991-01-01 348.711317786982 1992-01-01 218.492165902633 1993-01-01 380.527371084275 1994-01-01 619.065163447139 1995-01-01 760.559375774093 1996-01-01 1046.358510707540 1997-01-01 749.584649014640 1998-01-01 865.302161769888 1999-01-01 1098.425463406770 2000-01-01 1175.788980794710 2001-01-01 1326.970339298090 2002-01-01 1453.642776571750 2003-01-01 1890.681557335140 2004-01-01 2416.588235051940 2005-01-01 2709.142930613860 2006-01-01 3005.012903318510 2007-01-01 3603.013685366380 2008-01-01 4370.539646531480 2009-01-01 4114.136544909450 2010-01-01 4094.358831919180 2011-01-01 4437.178068436080 2012-01-01 4247.614308262460 2013-01-01 4413.081696706010 2014-01-01 4578.666727532590 2015-01-01 3952.830781165860 2016-01-01 4131.872340652720 2017-01-01 4537.862492447800