Year Dollars 1997-01-01 449414 2002-01-01 263756 2003-01-01 131308 2004-01-01 1015530 2005-01-01 545177 2006-01-01 1439416 2007-01-01 2418407 2008-01-01 3629357 2009-01-01 1512965 2010-01-01 1519341 2011-01-01 3013585 2012-01-01 4210401 2013-01-01 5327821 2014-01-01 6451473 2015-01-01 2158188 2016-01-01 1098571