Year Dollars 1997-01-01 232648 2002-01-01 723009 2003-01-01 1200670 2004-01-01 33003 2007-01-01 82736 2011-01-01 821355 2012-01-01 547967 2013-01-01 419258 2014-01-01 415847 2015-01-01 332269 2016-01-01 420451