Year Dollars 1992-01-01 637588 1997-01-01 1811212 2002-01-01 161566 2004-01-01 1491066 2005-01-01 2991004 2006-01-01 3599519 2007-01-01 4423828 2008-01-01 3037494 2009-01-01 1262466 2010-01-01 2512798 2011-01-01 1581737 2012-01-01 1943006 2013-01-01 2364342 2014-01-01 3016327 2015-01-01 1786685 2016-01-01 2280081