Year Dollars 1992-01-01 453828 1997-01-01 1682006 2002-01-01 4091585 2003-01-01 6032419 2005-01-01 15471652 2006-01-01 15626486 2007-01-01 5808859 2008-01-01 29108877 2009-01-01 25936956 2010-01-01 66163123 2013-01-01 24280689 2014-01-01 10049511 2015-01-01 17929014