Year Dollars 1992-01-01 5978573 1997-01-01 10249947 2002-01-01 15867306 2003-01-01 22030545 2004-01-01 21153932 2005-01-01 31872253 2006-01-01 23852118 2007-01-01 29657378 2008-01-01 31586038 2009-01-01 18342987 2010-01-01 13519677 2011-01-01 20825388 2012-01-01 19164361 2013-01-01 30623558 2014-01-01 73560417 2015-01-01 36058275 2016-01-01 34276802