Year Current U.S. Dollars 1990-01-01 2124.84051428011 1991-01-01 1765.74455562095 1992-01-01 1667.68177731373 1993-01-01 1590.09588197453 1994-01-01 1460.05907589560 1995-01-01 1370.67655885011 1996-01-01 1452.44548758328 1997-01-01 1396.50178567820 1998-01-01 1511.77005267883 1999-01-01 1210.61171958620 2000-01-01 1276.28803410000 2001-01-01 1244.37318523431 2002-01-01 1479.31458271677 2003-01-01 1819.76605926177 2004-01-01 2378.62328600741 2005-01-01 3125.81053502853 2006-01-01 3847.43412382153 2007-01-01 4735.65760793999 2008-01-01 6377.36973201232 2009-01-01 5176.26382996990 2010-01-01 6029.39679982930 2011-01-01 6519.23019498892 2012-01-01 6940.15925359735 2013-01-01 7978.87261471076 2014-01-01 8318.51268992675 2015-01-01 5949.10630699748 2016-01-01 5022.62664330491 2017-01-01 5726.02967250931