Year Dollars 1992-01-01 3482418 1997-01-01 8621858 2002-01-01 8525084 2003-01-01 19304153 2004-01-01 37514859 2005-01-01 36845353 2006-01-01 36001617 2007-01-01 40198583 2008-01-01 45689282 2009-01-01 33392937 2010-01-01 36286157 2011-01-01 28959054 2012-01-01 49628575 2013-01-01 55353293 2014-01-01 57868124 2015-01-01 38257888 2016-01-01 39923691