Year Dollars 1992-01-01 1552625 1997-01-01 4198345 2002-01-01 1193809 2003-01-01 3381458 2004-01-01 3601646 2005-01-01 4015251 2006-01-01 5644428 2007-01-01 11088307 2008-01-01 15326828 2009-01-01 11335703 2010-01-01 14201903 2011-01-01 22614738 2012-01-01 24198777 2013-01-01 24869902 2014-01-01 27351902 2015-01-01 27844850 2016-01-01 18186215