Year Dollars 1992-01-01 13849526 1997-01-01 6812495 2002-01-01 12274419 2003-01-01 14772649 2004-01-01 23187049 2005-01-01 25531031 2006-01-01 30559273 2007-01-01 36952903 2008-01-01 26066057 2009-01-01 21818307 2010-01-01 22171826 2011-01-01 26056098 2012-01-01 23265189 2013-01-01 24832371 2014-01-01 23116567 2015-01-01 21622872 2016-01-01 19059309