Year Dollars 1992-01-01 10897543 1997-01-01 23114378 2002-01-01 6371430 2003-01-01 5961696 2004-01-01 28896172 2005-01-01 36323407 2006-01-01 23410800 2007-01-01 33382535 2008-01-01 35800022 2009-01-01 38694524 2010-01-01 50736063 2011-01-01 53152011 2012-01-01 63746231 2013-01-01 60877657 2014-01-01 51870476 2015-01-01 26796346 2016-01-01 23471847