Year Dollars 1992-01-01 999257 1997-01-01 2132886 2002-01-01 3531016 2003-01-01 6600202 2004-01-01 10139484 2005-01-01 17827806 2006-01-01 17887147 2007-01-01 28713675 2008-01-01 34558920 2010-01-01 32258204 2012-01-01 8439568 2013-01-01 9653388 2014-01-01 6388816 2015-01-01 6137698 2016-01-01 10416950