Year U.S. Dollars 2000-01-01 275500000 2001-01-01 259100000 2002-01-01 273600000 2003-01-01 374100000 2004-01-01 414000000 2005-01-01 401500000 2006-01-01 351900000 2007-01-01 443200000 2008-01-01 977000000 2009-01-01 1024400000 2010-01-01 933300000 2011-01-01 498200000 2012-01-01 664000000 2013-01-01 685200000 2014-01-01 672400000 2015-01-01 580900000