Year Dollars 1992-01-01 156828330 1997-01-01 215963843 2002-01-01 174761306 2003-01-01 172667852 2004-01-01 181048003 2005-01-01 106892284 2006-01-01 160762984 2007-01-01 154183718 2008-01-01 186701849 2009-01-01 127680610 2010-01-01 148711507 2011-01-01 172523333 2012-01-01 206257911 2013-01-01 189242770 2014-01-01 306983018 2015-01-01 523505375 2016-01-01 278409428