Year	Dollars
1997-01-01	4138918
2002-01-01	4406270
2003-01-01	6901973
2004-01-01	10788597
2005-01-01	9033687
2007-01-01	22756692
2008-01-01	21479346
2009-01-01	20695336
2010-01-01	33523006
2011-01-01	49546132