Year Dollars 1992-01-01 4498782 2002-01-01 12026835 2003-01-01 11663561 2004-01-01 15852583 2005-01-01 20325581 2006-01-01 8238118 2007-01-01 26720278 2008-01-01 29532775 2009-01-01 22415306 2010-01-01 24390811 2011-01-01 15872567 2012-01-01 17796805 2013-01-01 31521583 2014-01-01 26866300 2015-01-01 18133339 2016-01-01 13063335