Year Dollars 1997-01-01 44181 2003-01-01 46518 2006-01-01 11634 2008-01-01 22211 2009-01-01 59575 2010-01-01 31918 2011-01-01 263885 2012-01-01 97150 2014-01-01 202856 2015-01-01 172672