Year Dollars 2004-01-01 85283 2007-01-01 19157 2008-01-01 13352 2010-01-01 81648 2011-01-01 68815 2012-01-01 145558 2013-01-01 96081 2014-01-01 213879 2015-01-01 285291 2016-01-01 548619