Year Dollars 1997-01-01 18496 2002-01-01 81265 2004-01-01 16132 2006-01-01 66541 2007-01-01 187442 2008-01-01 2670911 2009-01-01 3136730 2010-01-01 8835066 2011-01-01 1405982 2012-01-01 829539 2013-01-01 2851372 2014-01-01 2133260 2015-01-01 594667 2016-01-01 481383