Year Dollars 1992-01-01 316020499 1997-01-01 321346511 2002-01-01 319700921 2003-01-01 360205662 2004-01-01 262469310 2005-01-01 346712681 2006-01-01 391780500 2007-01-01 424476815 2008-01-01 518495759 2009-01-01 478967515 2010-01-01 535250316 2011-01-01 567564970 2012-01-01 586417738 2013-01-01 577335140 2014-01-01 639080536 2015-01-01 726609512 2016-01-01 872584460