Year Dollars 1997-01-01 21627 2004-01-01 29643 2007-01-01 111622 2008-01-01 46444 2009-01-01 514246 2010-01-01 236842 2011-01-01 184618 2012-01-01 186847 2013-01-01 56574 2014-01-01 282350 2015-01-01 551952 2016-01-01 377242