Year Dollars 1997-01-01 21953204 2002-01-01 13802812 2003-01-01 22685703 2004-01-01 43041833 2005-01-01 41969558 2006-01-01 53630417 2007-01-01 39813466 2008-01-01 38341882 2009-01-01 31707979 2010-01-01 32651034 2011-01-01 41654159 2012-01-01 49853301 2013-01-01 42428457 2014-01-01 54155364 2015-01-01 100297983 2016-01-01 86822193