Year Dollars 1992-01-01 5936001 1997-01-01 9715364 2002-01-01 18292620 2003-01-01 15935388 2004-01-01 17172660 2005-01-01 16464480 2006-01-01 23162632 2007-01-01 21548453 2008-01-01 29190641 2009-01-01 33230851 2010-01-01 27664871 2011-01-01 31671665 2012-01-01 32435172 2013-01-01 49713926 2014-01-01 15642151 2015-01-01 12870982 2016-01-01 25840553