Year	2005 U.S. Dollars
1998-01-01	57518.4830525603
1999-01-01	59277.6679638566
2000-01-01	62291.6322344133
2001-01-01	60910.1476397047
2002-01-01	59476.0431208665
2003-01-01	57144.0024166061
2004-01-01	56847.3536259938
2005-01-01	57209.2491624825
2006-01-01	59571.1263874480
2007-01-01	62641.0623405128