Year Dollars 1992-01-01 2135473 1997-01-01 5423797 2002-01-01 3297143 2003-01-01 4265433 2004-01-01 2649403 2005-01-01 3177879 2006-01-01 4735162 2007-01-01 4997420 2008-01-01 10684237 2009-01-01 6676404 2010-01-01 8466622 2011-01-01 13011233 2012-01-01 12707687 2013-01-01 11470466 2014-01-01 19569132 2015-01-01 16026607 2016-01-01 15366560