Year	2010 U.S. Dollars
1985-01-01	566.800155955764
1986-01-01	571.478194325809
1987-01-01	572.243868059693
1988-01-01	580.319733416877
1989-01-01	570.811380021274
1990-01-01	556.762547049761
1991-01-01	543.534505829677
1992-01-01	508.083858060876
1993-01-01	491.768127583912
1994-01-01	484.981325917099
1995-01-01	488.851856352028
1996-01-01	501.108609932004
1997-01-01	505.160270905766
1998-01-01	508.716280711691
1999-01-01	511.095998995735
2000-01-01	509.137652728923
2001-01-01	518.138111300623
2002-01-01	516.569258165650
2003-01-01	518.720391187973
2004-01-01	532.445488757142
2005-01-01	549.151253886496
2006-01-01	560.112144336690
2007-01-01	578.118667151897
2008-01-01	590.211462115779
2009-01-01	604.775373350933
2010-01-01	628.509570516666
2011-01-01	639.991358783003
2012-01-01	663.066653766293
2013-01-01	683.519998528185
2014-01-01	704.376152086879
2015-01-01	698.922196247987
2016-01-01	698.218824627266
2017-01-01	719.349302141512