Year Dollars 1992-01-01 10645473 1997-01-01 19397388 2002-01-01 16462797 2003-01-01 20056613 2004-01-01 15851159 2005-01-01 20777050 2006-01-01 8629139 2007-01-01 10608564 2008-01-01 24823985 2009-01-01 10617425 2010-01-01 28998359 2011-01-01 23015570 2012-01-01 17762403 2013-01-01 17612602 2014-01-01 15533167 2015-01-01 12443879 2016-01-01 16801665