Year Dollars 1992-01-01 3657848 1997-01-01 11440462 2002-01-01 17066194 2003-01-01 28078943 2004-01-01 27708776 2005-01-01 29810735 2006-01-01 23524523 2007-01-01 29253851 2008-01-01 28250903 2009-01-01 23810236 2010-01-01 28992977 2011-01-01 28435508 2012-01-01 22475092 2013-01-01 40248881 2014-01-01 34729345 2015-01-01 38168102 2016-01-01 38650244