Year Dollars 1992-01-01 3302302 1997-01-01 4122306 2002-01-01 6148224 2003-01-01 9083882 2004-01-01 4606440 2005-01-01 6856740 2006-01-01 10999448 2007-01-01 12705349 2008-01-01 15957456 2009-01-01 28434357 2010-01-01 14225566 2011-01-01 25105223 2012-01-01 12550608 2013-01-01 40317540 2014-01-01 27142224 2015-01-01 28011120 2016-01-01 37256313