Year Dollars 1997-01-01 3047111 2002-01-01 4440621 2003-01-01 5109913 2004-01-01 5916711 2005-01-01 8761720 2006-01-01 17038015 2007-01-01 26604556 2008-01-01 45011699 2009-01-01 51675159 2010-01-01 54623749 2011-01-01 83490567 2012-01-01 57131930 2013-01-01 80128350 2014-01-01 82640401 2015-01-01 84178284 2016-01-01 78779321