Year Dollars 1992-01-01 4218889 1997-01-01 10589556 2002-01-01 5342766 2003-01-01 9528830 2004-01-01 5678327 2005-01-01 6611865 2006-01-01 9562896 2007-01-01 22514325 2008-01-01 14091194 2009-01-01 9993646 2010-01-01 6693215 2011-01-01 18057461 2012-01-01 11139011 2013-01-01 17528848 2014-01-01 11783835 2015-01-01 10396585 2016-01-01 17998032