Year Dollars 1992-01-01 10179256 1997-01-01 978773 2002-01-01 6210678 2003-01-01 5003399 2004-01-01 9693407 2005-01-01 17172837 2006-01-01 42552168 2007-01-01 74412606 2008-01-01 144546685 2009-01-01 45061030 2010-01-01 69492875 2011-01-01 152870410 2012-01-01 176225623 2013-01-01 49848995 2014-01-01 61447210 2015-01-01 23282708 2016-01-01 21947042