Year Dollars 1992-01-01 17971492 2004-01-01 12675919 2005-01-01 13749770 2006-01-01 20601714 2007-01-01 19245681 2008-01-01 14268671 2009-01-01 13759624 2010-01-01 5922096 2011-01-01 7659610 2012-01-01 6564457 2013-01-01 16368435 2015-01-01 172922