Year	US Dollars, Sum Over Component Sub-periods
1988-01-01	-722100000
1989-01-01	-2899300000
1990-01-01	-1667400000
1991-01-01	-2313000000
1992-01-01	-218500000
1993-01-01	29151400000
1994-01-01	35873500000
1995-01-01	39903700000
1996-01-01	60175700000
1997-01-01	47093300000
1998-01-01	35521800000
1999-01-01	23494400000
2000-01-01	9547500000
2001-01-01	15591500000
2002-01-01	13230100000
2003-01-01	11209200000
2004-01-01	11000600000
2005-01-01	668600000
2006-01-01	-12806600000
2007-01-01	4386100000
2008-01-01	-3111200000
2009-01-01	1143400000
2010-01-01	-27704400000
2011-01-01	-24164300000
2012-01-01	21895700000
2013-01-01	49434600000