Year Dollars 1997-01-01 6432083 2002-01-01 10422920 2003-01-01 4034855 2004-01-01 3152189 2005-01-01 5792846 2006-01-01 4978802 2007-01-01 5699010 2008-01-01 4609966 2009-01-01 3761806 2010-01-01 4702221 2011-01-01 3909056 2012-01-01 15716635 2013-01-01 9655430 2014-01-01 6554282 2015-01-01 14777163 2016-01-01 15750699