Year	2010 U.S. Dollars
1992-01-01	378.195428852937
1993-01-01	431.785457796836
1994-01-01	525.724216825098
1995-01-01	539.926147948884
1996-01-01	584.953704958787
1997-01-01	622.236645893419
1998-01-01	620.917484685620
1999-01-01	606.325512678544
2000-01-01	571.603230594319
2001-01-01	603.105100089818
2002-01-01	601.034246875246
2003-01-01	565.725053670377
2004-01-01	556.035639862693
2005-01-01	554.488199426537
2006-01-01	535.929673118151
2007-01-01	532.231477277782
2008-01-01	471.166624825861
2009-01-01	480.608925018737
2010-01-01	482.149090423500
2011-01-01	514.179598235775