Year Dollars 1992-01-01 18693518 1997-01-01 22105034 2002-01-01 37269745 2003-01-01 38646039 2004-01-01 52492669 2005-01-01 48784483 2006-01-01 36134927 2007-01-01 46803231 2008-01-01 52422339 2009-01-01 49657564 2010-01-01 68864395 2011-01-01 60321339 2012-01-01 60051833 2013-01-01 63039614 2014-01-01 67975647 2015-01-01 66510806 2016-01-01 73228670