Year Dollars 1992-01-01 10270854 1997-01-01 12837028 2002-01-01 15847271 2003-01-01 16189879 2004-01-01 18790744 2005-01-01 20061156 2006-01-01 31921810 2007-01-01 46668539 2008-01-01 46518892 2009-01-01 43205659 2010-01-01 44824508 2011-01-01 44966653 2012-01-01 59491289 2013-01-01 87694499 2014-01-01 63052542 2015-01-01 59358121 2016-01-01 56345317