Year Dollars 1992-01-01 7026913 1997-01-01 4373080 2002-01-01 5574379 2003-01-01 6048865 2004-01-01 5731823 2005-01-01 7839752 2006-01-01 9144157 2007-01-01 11680295 2008-01-01 10960238 2009-01-01 12146186 2010-01-01 12443962 2011-01-01 15492378 2012-01-01 16060454 2013-01-01 13541831 2014-01-01 16001005 2015-01-01 14636531 2016-01-01 12428601