Year	US Dollars, Sum Over Component Sub-periods
1998-01-01	-6400000000
1999-01-01	-8500000000
2000-01-01	-10500000000
2001-01-01	-47300000000
2002-01-01	-75500000000
2003-01-01	-106100000000
2004-01-01	-190100000000
2005-01-01	-250600000000
2006-01-01	-284800000000
2007-01-01	-460700000000
2008-01-01	-479500000000
2009-01-01	-400300000000
2010-01-01	-471700000000
2011-01-01	-387800000000
2012-01-01	-96500000000