Year Dollars 1992-01-01 18679874 1997-01-01 221596 2004-01-01 871831 2005-01-01 2149046 2007-01-01 1183422 2008-01-01 603920 2011-01-01 1098457 2012-01-01 746226 2014-01-01 597724 2015-01-01 445591 2016-01-01 237992