Year Dollars 1997-01-01 1721351 2006-01-01 596264 2007-01-01 1428219 2008-01-01 1044158 2009-01-01 2992287 2010-01-01 1446617 2011-01-01 1802067 2012-01-01 1186677 2013-01-01 6947790 2014-01-01 52568753 2015-01-01 7525338 2016-01-01 10816198