Year Dollars 1992-01-01 3442734 1997-01-01 10535419 2002-01-01 4613825 2003-01-01 4607149 2004-01-01 9540617 2005-01-01 12313304 2006-01-01 19393673 2007-01-01 16037292 2008-01-01 16815646 2009-01-01 17957334 2010-01-01 19424628 2011-01-01 19989296 2012-01-01 25414712 2013-01-01 27773551 2014-01-01 35601587 2015-01-01 41817754 2016-01-01 65829908