Year Dollars 1992-01-01 13196083 1997-01-01 21266649 2002-01-01 26573911 2003-01-01 17986029 2004-01-01 23966593 2005-01-01 24805549 2006-01-01 14836409 2007-01-01 10192795 2008-01-01 25926655 2009-01-01 13684685 2010-01-01 16778914 2011-01-01 20886724 2012-01-01 15711206 2013-01-01 14630053 2014-01-01 17426239 2015-01-01 24787300 2016-01-01 23338773