Year Dollars 1992-01-01 16045962 1997-01-01 9248011 2002-01-01 11848643 2003-01-01 10002522 2004-01-01 6357166 2005-01-01 7253024 2006-01-01 10288966 2007-01-01 13446977 2008-01-01 17272191 2009-01-01 12684866 2010-01-01 16120055 2011-01-01 19525012 2012-01-01 25672147 2013-01-01 18912588 2014-01-01 26974192 2015-01-01 31779382 2016-01-01 31226067