Year Dollars 2002-01-01 58358 2006-01-01 141864 2007-01-01 397881 2008-01-01 40365 2010-01-01 16841 2011-01-01 163770 2013-01-01 67511 2014-01-01 137650 2015-01-01 78112 2016-01-01 167938