Year Dollars 1997-01-01 2467466 2002-01-01 540206 2006-01-01 724990 2007-01-01 437317 2008-01-01 227948 2009-01-01 1957714 2010-01-01 4054798 2011-01-01 4326839 2012-01-01 354099 2013-01-01 1176010 2014-01-01 4778324 2015-01-01 12456261 2016-01-01 2040152