Year Dollars 1992-01-01 536323 1997-01-01 2042671 2004-01-01 10214443 2005-01-01 31219431 2006-01-01 20951580 2007-01-01 60924997 2008-01-01 136016720 2009-01-01 30185820 2010-01-01 11307285 2011-01-01 43193482 2012-01-01 52598911 2013-01-01 20447137 2014-01-01 16104300 2015-01-01 4663696 2016-01-01 19490623