Year Dollars 1997-01-01 415928 2006-01-01 108517 2007-01-01 127769 2008-01-01 591339 2009-01-01 43687 2011-01-01 231977 2012-01-01 410319 2013-01-01 544362 2015-01-01 513183 2016-01-01 528911