Year Dollars 1992-01-01 2393514 1997-01-01 23015924 2002-01-01 25026529 2003-01-01 20238056 2004-01-01 28077995 2005-01-01 25986040 2006-01-01 21972492 2007-01-01 23114340 2008-01-01 14306230 2009-01-01 11765011 2010-01-01 13891904 2011-01-01 15020924 2012-01-01 18379210 2013-01-01 17864464 2014-01-01 20816164 2015-01-01 16667669 2016-01-01 17974175