Year Dollars 1992-01-01 3104352 1997-01-01 6558956 2002-01-01 2261336 2003-01-01 3881097 2004-01-01 5024000 2005-01-01 7029202 2006-01-01 15024817 2007-01-01 33918780 2008-01-01 11655727 2009-01-01 11940060 2010-01-01 22212662 2011-01-01 34241410 2012-01-01 22405737 2013-01-01 22089114 2014-01-01 21115160 2015-01-01 24169435 2016-01-01 24249297