Year Dollars 1997-01-01 21614 2003-01-01 34352 2004-01-01 41333 2006-01-01 20333 2008-01-01 83052 2009-01-01 398836 2010-01-01 51873 2011-01-01 451832 2015-01-01 552612 2016-01-01 1742932