Year Dollars 1997-01-01 792098 2002-01-01 1113804 2003-01-01 1126243 2004-01-01 1288221 2005-01-01 4406421 2006-01-01 2809867 2007-01-01 4217369 2008-01-01 7917157 2009-01-01 14984276 2010-01-01 14002690 2011-01-01 13855839 2012-01-01 16969277 2013-01-01 17731047 2014-01-01 20855153 2015-01-01 26178698 2016-01-01 26204730