Year Dollars 1992-01-01 1263160 1997-01-01 2157119 2002-01-01 4613125 2003-01-01 3950362 2004-01-01 4957875 2005-01-01 6875802 2006-01-01 6451575 2007-01-01 7807160 2008-01-01 8881985 2009-01-01 8172314 2010-01-01 7825083 2011-01-01 10335346 2012-01-01 11980041 2013-01-01 12051073 2014-01-01 15626378 2015-01-01 14378518 2016-01-01 20373599