Year Dollars 2004-01-01 232551 2005-01-01 120316 2006-01-01 91283 2007-01-01 562798 2008-01-01 1374496 2009-01-01 1812915 2010-01-01 4059629 2011-01-01 6538858 2012-01-01 2839648 2014-01-01 299185 2015-01-01 160613