Year Dollars 1997-01-01 527859 2002-01-01 231838 2004-01-01 1197474 2005-01-01 1319041 2006-01-01 2216264 2007-01-01 2738483 2008-01-01 4503005 2009-01-01 1498769 2010-01-01 4325671 2011-01-01 2799259 2012-01-01 2914916 2013-01-01 3073886 2014-01-01 3554179 2015-01-01 5814878 2016-01-01 4636074