Year Dollars 1992-01-01 6690540 1997-01-01 2658824 2002-01-01 11142797 2003-01-01 8583896 2004-01-01 10781062 2005-01-01 11952307 2006-01-01 10726784 2007-01-01 17044106 2008-01-01 21918531 2009-01-01 19640451 2010-01-01 19900768 2011-01-01 19269302 2012-01-01 24216970 2013-01-01 16422986 2014-01-01 20177452 2015-01-01 21764609 2016-01-01 26452978