Year Dollars 1992-01-01 5301394 1997-01-01 23258009 2002-01-01 19268493 2003-01-01 13254177 2004-01-01 21384582 2005-01-01 24123382 2006-01-01 19152470 2007-01-01 26435308 2008-01-01 36245396 2009-01-01 35449300 2010-01-01 26673754 2011-01-01 35874222 2012-01-01 30334870 2013-01-01 24713648 2014-01-01 20799668 2015-01-01 18661037 2016-01-01 19157735