Year Dollars 1992-01-01 1177080 1997-01-01 735257 2007-01-01 13016492 2008-01-01 6422165 2009-01-01 2129372 2010-01-01 2445340 2013-01-01 16881485 2015-01-01 541339 2016-01-01 635035