Year Dollars 1992-01-01 537012 1997-01-01 1901257 2002-01-01 4658654 2003-01-01 6776978 2004-01-01 4188694 2005-01-01 2293028 2006-01-01 5377669 2007-01-01 6571621 2008-01-01 5774861 2009-01-01 2713964 2010-01-01 4641082 2011-01-01 6107883 2012-01-01 3133435 2013-01-01 4905812 2014-01-01 2896284 2015-01-01 3411410 2016-01-01 3543626