Year Dollars 1992-01-01 20742066 1997-01-01 24629537 2002-01-01 49571811 2003-01-01 38296217 2004-01-01 40388562 2005-01-01 48416050 2006-01-01 51077584 2007-01-01 62189661 2008-01-01 77049580 2009-01-01 55475040 2010-01-01 58536325 2011-01-01 61742202 2012-01-01 69869860 2013-01-01 62476705 2014-01-01 81431866 2015-01-01 72122599 2016-01-01 74399853