Year Dollars 1992-01-01 3701592 1997-01-01 8301177 2002-01-01 7791106 2003-01-01 8549688 2004-01-01 11295098 2005-01-01 14814994 2006-01-01 20812739 2007-01-01 24863142 2008-01-01 31425947 2009-01-01 18418429 2010-01-01 27316208 2011-01-01 46104681 2012-01-01 48679464 2013-01-01 53936395 2014-01-01 46192935 2015-01-01 38647633 2016-01-01 33845070