Year	Current U.S. Dollars
1981-01-01	1332.640563030910
1982-01-01	1435.767096597700
1983-01-01	1495.015748728250
1984-01-01	1121.664163669310
1985-01-01	1137.690353877270
1986-01-01	1465.448402383770
1987-01-01	1485.539626123090
1988-01-01	1533.445039209510
1989-01-01	1670.692869900530
1990-01-01	1172.443065822100
1991-01-01	1072.635835191290
1992-01-01	587.301399263190
1993-01-01	339.519986812731
1994-01-01	405.971811490783
1995-01-01	631.914865343192
1996-01-01	580.911094891204
1997-01-01	505.602915979188
1998-01-01	477.349729357953
1999-01-01	445.006943416605
2000-01-01	474.213336086127
2001-01-01	524.014592388925
2002-01-01	571.501883026268
2003-01-01	646.056129497955
2004-01-01	797.837743226608
2005-01-01	998.822667102654
2006-01-01	1334.651896126290
2007-01-01	1634.081431396900
2008-01-01	2139.625630864110
2009-01-01	1717.898761299740
2010-01-01	2650.353648304380
2011-01-01	3769.595269158790
2012-01-01	4368.082247551080
2013-01-01	4385.379354688460
2014-01-01	4181.583312842200
2015-01-01	3946.962074548650
2016-01-01	3694.082552346370
2017-01-01	3735.164302354290