Year Dollars 1997-01-01 479534 2004-01-01 32099 2006-01-01 369353 2007-01-01 88260 2008-01-01 121597 2009-01-01 402595 2010-01-01 298967 2011-01-01 842160 2012-01-01 494363 2013-01-01 1447523 2014-01-01 4434037 2015-01-01 921787 2016-01-01 506047