Year Dollars 1992-01-01 178467856 1997-01-01 212942932 2002-01-01 203930348 2003-01-01 234804909 2004-01-01 280571532 2005-01-01 288057224 2006-01-01 311468661 2007-01-01 288524213 2008-01-01 320751944 2009-01-01 309407557 2010-01-01 336217402 2011-01-01 304173651 2012-01-01 330199324 2013-01-01 284195075 2014-01-01 229017715 2015-01-01 208144524 2016-01-01 284194940