Year Dollars 1992-01-01 2065390 1997-01-01 4774803 2002-01-01 8208988 2003-01-01 5146625 2004-01-01 9141993 2005-01-01 4054603 2006-01-01 15090821 2007-01-01 8756018 2008-01-01 25642621 2009-01-01 10104097 2010-01-01 13670131 2011-01-01 9983234 2012-01-01 16161153 2013-01-01 18986846 2014-01-01 22056557 2015-01-01 23510553 2016-01-01 15396349