Year Dollars 1997-01-01 147901 2006-01-01 23016 2008-01-01 36194 2009-01-01 37835 2010-01-01 189691 2011-01-01 221464 2012-01-01 69969 2013-01-01 115728 2014-01-01 67591 2015-01-01 53050 2016-01-01 24098