Year Dollars 1992-01-01 7818626694 1997-01-01 14174230650 2002-01-01 10274081540 2003-01-01 10964001895 2004-01-01 12552523620 2005-01-01 12897428071 2006-01-01 13109399087 2007-01-01 12890161163 2008-01-01 12380312559 2009-01-01 10373219816 2010-01-01 11679784952 2011-01-01 12504106667 2012-01-01 12443660458 2013-01-01 12191093916 2014-01-01 11769552616 2015-01-01 11422520202