Year Dollars 1992-01-01 34831254 1997-01-01 27870611 2002-01-01 18639604 2003-01-01 24541570 2004-01-01 15944181 2005-01-01 16505500 2006-01-01 21076410 2007-01-01 19929671 2008-01-01 27530727 2009-01-01 18530368 2010-01-01 11098138 2011-01-01 8368693 2012-01-01 24029666 2013-01-01 27619852 2014-01-01 35284709 2015-01-01 24685209 2016-01-01 20526402