Year Dollars 1992-01-01 18481730 2002-01-01 50529935 2004-01-01 49210511 2005-01-01 38997651 2006-01-01 47415091 2007-01-01 40084737 2008-01-01 28726409 2009-01-01 49079963 2010-01-01 47919053 2011-01-01 27383605 2012-01-01 42116961 2013-01-01 59927276 2014-01-01 53776163 2015-01-01 44163295 2016-01-01 33257514