Year Dollars 1992-01-01 21178570 1997-01-01 11387016 2002-01-01 12446548 2003-01-01 8433915 2004-01-01 19191548 2005-01-01 12956503 2006-01-01 15067789 2007-01-01 26051368 2008-01-01 32215633 2009-01-01 21172377 2010-01-01 29830744 2011-01-01 29575879 2012-01-01 35535256 2013-01-01 31635588 2014-01-01 29476840 2015-01-01 18238173 2016-01-01 25180768