Year Dollars 1997-01-01 33748 2003-01-01 52522 2006-01-01 122908 2007-01-01 500718 2008-01-01 50951 2011-01-01 738808 2012-01-01 215674 2013-01-01 226935 2014-01-01 379411 2015-01-01 555486 2016-01-01 510414