Year	US Dollars, Sum Over Component Sub-periods
1994-01-01	-850000000
1995-01-01	-280000000
1996-01-01	2940000000
1997-01-01	4440000000
1998-01-01	7420000000
1999-01-01	10360000000
2000-01-01	9638000000
2001-01-01	3685000000
2002-01-01	6538000000
2003-01-01	7445000000
2004-01-01	8387000000
2005-01-01	8040000000
2006-01-01	12886000000
2007-01-01	29801000000
2008-01-01	47118000000
2009-01-01	27200000000
2010-01-01	34492000000
2011-01-01	35688000000
2012-01-01	22330000000
2013-01-01	15289000000