Year Dollars 1992-01-01 828368 1997-01-01 863946 2002-01-01 2682975 2003-01-01 8188115 2004-01-01 4327395 2005-01-01 8111361 2006-01-01 14383398 2007-01-01 12544822 2008-01-01 22836281 2009-01-01 8584461 2010-01-01 14455229 2011-01-01 13362724 2012-01-01 12038393 2013-01-01 11974142 2014-01-01 10138650 2015-01-01 14549951 2016-01-01 17999077