Year Dollars 1992-01-01 1074440 1997-01-01 2026307 2002-01-01 2835527 2003-01-01 2733515 2004-01-01 3893512 2005-01-01 5064200 2006-01-01 8511540 2007-01-01 16275520 2008-01-01 23638728 2009-01-01 12724598 2010-01-01 18354911 2011-01-01 18752759 2012-01-01 15976448 2013-01-01 20144532 2014-01-01 17226351 2015-01-01 18348786 2016-01-01 20851668