Year Dollars 1997-01-01 717824 2002-01-01 1618085 2003-01-01 1998792 2004-01-01 3507713 2005-01-01 3348268 2006-01-01 4040745 2007-01-01 3358350 2008-01-01 2490589 2009-01-01 10983413 2014-01-01 22678503 2015-01-01 5554580 2016-01-01 3585039