Year Dollars 1992-01-01 531578 1997-01-01 2201402 2002-01-01 9831190 2003-01-01 12601483 2004-01-01 12771311 2005-01-01 9261172 2006-01-01 12092021 2007-01-01 20276956 2008-01-01 20750383 2009-01-01 21437458 2010-01-01 25348769 2011-01-01 26973479 2012-01-01 17979904 2013-01-01 13299079 2014-01-01 10426911 2015-01-01 11647807 2016-01-01 15594817