Year Dollars 1992-01-01 235966 1997-01-01 1455403 2002-01-01 686678 2003-01-01 1842538 2004-01-01 1547728 2005-01-01 2097401 2006-01-01 4688385 2007-01-01 2526372 2008-01-01 2751587 2009-01-01 1775301 2010-01-01 2821980 2011-01-01 4145177 2012-01-01 4554829 2013-01-01 3685710 2014-01-01 4428198 2015-01-01 6175189 2016-01-01 4641034