Year	US Dollars, Sum Over Component Sub-periods
1988-01-01	-4663110000
1989-01-01	-2134600000
1990-01-01	-7420050000
1991-01-01	-7621030000
1992-01-01	-4270200000
1993-01-01	-7117960000
1994-01-01	-6041750000
1995-01-01	-6477870000
1996-01-01	-7842740000
1997-01-01	-11012020000
1998-01-01	-13748180000
1999-01-01	-6772060000
2000-01-01	-12358350000
2001-01-01	-21536210000
2002-01-01	-17182730000
2003-01-01	-9079680000
2004-01-01	-19272870000
2005-01-01	-41793670000
2006-01-01	-42088760000
2007-01-01	-90797160000
2008-01-01	-66871610000
2009-01-01	-21273950000
2010-01-01	-32653750000
2011-01-01	-53639060000
2012-01-01	-7983230000
2013-01-01	-31656810000